21903002102856 has 64 divisors (see below), whose sum is σ = 62584435728000. Its totient is φ = 6257557628928.

The previous prime is 21903002102743. The next prime is 21903002102929. The reversal of 21903002102856 is 65820120030912.

It is a super-3 number, since 3×21903002102856³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 2230185 + ... + 6984248.

It is an arithmetic number, because the mean of its divisors is an integer number (977881808250).

Almost surely, 2^{21903002102856} is an apocalyptic number.

It is an amenable number.

21903002102856 is an abundant number, since it is smaller than the sum of its proper divisors (40681433625144).

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

21903002102856 is a wasteful number, since it uses less digits than its factorization.

21903002102856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9228598 (or 9228594 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 21903002102856 in words is "twenty-one trillion, nine hundred three billion, two million, one hundred two thousand, eight hundred fifty-six".