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21000101112020 = 2251955263423979
BaseRepresentation
bin1001100011001011101111…
…00100010010100011010100
32202100120221011010221202102
410301211313210102203110
510223031201341041040
6112355151355501232
74265131040144102
oct461456744224324
982316834127672
1021000101112020
116767102673988
122431b63457818
13b943bb4c2274
145285a5ca4c72
152663da421515
hex1319779128d4

21000101112020 has 24 divisors (see below), whose sum is σ = 46421276143200. Its totient is φ = 7957933052832.

The previous prime is 21000101111989. The next prime is 21000101112031. The reversal of 21000101112020 is 2021110100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000101111992 and 21000101112010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27631711610 + ... + 27631712369.

It is an arithmetic number, because the mean of its divisors is an integer number (1934219839300).

Almost surely, 221000101112020 is an apocalyptic number.

21000101112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000101112020 is an abundant number, since it is smaller than the sum of its proper divisors (25421175031180).

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

21000101112020 is a wasteful number, since it uses less digits than its factorization.

21000101112020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55263424007 (or 55263424005 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21000101112020 its reverse (2021110100012), we get a palindrome (23021211212032).

The spelling of 21000101112020 in words is "twenty-one trillion, one hundred one million, one hundred twelve thousand, twenty".

Divisors: 1 2 4 5 10 19 20 38 76 95 190 380 55263423979 110526847958 221053695916 276317119895 552634239790 1050005055601 1105268479580 2100010111202 4200020222404 5250025278005 10500050556010 21000101112020