21008874084 has 48 divisors (see below), whose sum is σ = 55802234880. Its totient is φ = 6089527840.

The previous prime is 21008874071. The next prime is 21008874097. The reversal of 21008874084 is 48047880012.

It is an interprime number because it is at equal distance from previous prime (21008874071) and next prime (21008874097).

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, 3456924 + ... + 3462995.

It is an arithmetic number, because the mean of its divisors is an integer number (1162546560).

Almost surely, 2^21008874084 is an apocalyptic number.

It is an amenable number.

21008874084 is an abundant number, since it is smaller than the sum of its proper divisors (34793360796).

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

21008874084 is a wasteful number, since it uses less digits than its factorization.

21008874084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6919960 (or 6919958 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 42.

The spelling of 21008874084 in words is "twenty-one billion, eight million, eight hundred seventy-four thousand, eighty-four".