21038657433960 has 64 divisors (see below), whose sum is σ = 64821809404800. Its totient is φ = 5458678684416.

The previous prime is 21038657433929. The next prime is 21038657433961. The reversal of 21038657433960 is 6933475683012.

21038657433960 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21038657433960² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21038657433960.

It is not an unprimeable number, because it can be changed into a prime (21038657433961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2369213740 + ... + 2369222619.

It is an arithmetic number, because the mean of its divisors is an integer number (1012840771950).

It is a 1-persistent number, because it is pandigital, but 2⋅21038657433960 = 42077314867920 is not.

Almost surely, 2^{21038657433960} is an apocalyptic number.

21038657433960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21038657433960 is an abundant number, since it is smaller than the sum of its proper divisors (43783151970840).

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

21038657433960 is a wasteful number, since it uses less digits than its factorization.

21038657433960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738436410 (or 4738436406 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 57.

The spelling of 21038657433960 in words is "twenty-one trillion, thirty-eight billion, six hundred fifty-seven million, four hundred thirty-three thousand, nine hundred sixty".