Base | Representation |
---|---|
bin | 1001101100010111111011… |
… | …10110100100101000011100 |
3 | 2210110210000210101010020000 |
4 | 10312023331312210220130 |
5 | 10243214413441223340 |
6 | 113200214432054300 |
7 | 4330010354066511 |
oct | 466137566445034 |
9 | 83423023333200 |
10 | 21315886664220 |
11 | 6879020355195 |
12 | 24831b3394390 |
13 | bb81058318b5 |
14 | 5399a16b5308 |
15 | 26e71d865d30 |
hex | 1362fdda4a1c |
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".
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