21516902862 has 64 divisors (see below), whose sum is σ = 53690327040. Its totient is φ = 5597040384.

The previous prime is 21516902851. The next prime is 21516902863. The reversal of 21516902862 is 26820961512.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21516902863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230062 + ... + 309777.

It is an arithmetic number, because the mean of its divisors is an integer number (838911360).

Almost surely, 2^21516902862 is an apocalyptic number.

21516902862 is an abundant number, since it is smaller than the sum of its proper divisors (32173424178).

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

21516902862 is a wasteful number, since it uses less digits than its factorization.

21516902862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539937.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 21516902862 in words is "twenty-one billion, five hundred sixteen million, nine hundred two thousand, eight hundred sixty-two".