21755065553156 has 48 divisors (see below), whose sum is σ = 41679979482624. Its totient is φ = 9875342036736.

The previous prime is 21755065553149. The next prime is 21755065553161. The reversal of 21755065553156 is 65135556055712.

It is a super-2 number, since 2×21755065553156² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10339241 + ... + 12264176.

It is an arithmetic number, because the mean of its divisors is an integer number (868332905888).

Almost surely, 2^{21755065553156} is an apocalyptic number.

21755065553156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21755065553156 is a deficient number, since it is larger than the sum of its proper divisors (19924913929468).

21755065553156 is a wasteful number, since it uses less digits than its factorization.

21755065553156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22603740 (or 22603738 counting only the distinct ones).

The product of its (nonzero) digits is 23625000, while the sum is 56.

The spelling of 21755065553156 in words is "twenty-one trillion, seven hundred fifty-five billion, sixty-five million, five hundred fifty-three thousand, one hundred fifty-six".