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21315886664220 = 2234579166556389
BaseRepresentation
bin1001101100010111111011…
…10110100100101000011100
32210110210000210101010020000
410312023331312210220130
510243214413441223340
6113200214432054300
74330010354066511
oct466137566445034
983423023333200
1021315886664220
116879020355195
1224831b3394390
13bb81058318b5
145399a16b5308
1526e71d865d30
hex1362fdda4a1c

21315886664220 has 120 divisors (see below), whose sum is σ = 67715165918400. Its totient is φ = 5612284050048.

The previous prime is 21315886664213. The next prime is 21315886664243. The reversal of 21315886664220 is 2246668851312.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 83150215 + ... + 83406174.

It is an arithmetic number, because the mean of its divisors is an integer number (564293049320).

Almost surely, 221315886664220 is an apocalyptic number.

21315886664220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21315886664220 is an abundant number, since it is smaller than the sum of its proper divisors (46399279254180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21315886664220 is a wasteful number, since it uses less digits than its factorization.

21315886664220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166556489 (or 166556478 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 21315886664220 in words is "twenty-one trillion, three hundred fifteen billion, eight hundred eighty-six million, six hundred sixty-four thousand, two hundred twenty".

Divisors: 1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 45 54 60 79 81 90 108 135 158 162 180 237 270 316 324 395 405 474 540 711 790 810 948 1185 1422 1580 1620 2133 2370 2844 3555 4266 4740 6399 7110 8532 10665 12798 14220 21330 25596 31995 42660 63990 127980 166556389 333112778 499669167 666225556 832781945 999338334 1499007501 1665563890 1998676668 2498345835 2998015002 3331127780 4497022503 4996691670 5996030004 7495037505 8994045006 9993383340 13157954731 13491067509 14990075010 17988090012 22485112515 26315909462 26982135018 29980150020 39473864193 44970225030 52631818924 53964270036 65789773655 67455337545 78947728386 89940450060 118421592579 131579547310 134910675090 157895456772 197369320965 236843185158 263159094620 269821350180 355264777737 394738641930 473686370316 592107962895 710529555474 789477283860 1065794333211 1184215925790 1421059110948 1776323888685 2131588666422 2368431851580 3552647777370 4263177332844 5328971666055 7105295554740 10657943332110 21315886664220