21502772076 has 24 divisors (see below), whose sum is σ = 51023528640. Its totient is φ = 7046105872.

The previous prime is 21502772051. The next prime is 21502772077. The reversal of 21502772076 is 67027720512.

It is not an unprimeable number, because it can be changed into a prime (21502772077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15184866 + ... + 15186281.

It is an arithmetic number, because the mean of its divisors is an integer number (2125980360).

Almost surely, 2^21502772076 is an apocalyptic number.

It is an amenable number.

21502772076 is an abundant number, since it is smaller than the sum of its proper divisors (29520756564).

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

21502772076 is a wasteful number, since it uses less digits than its factorization.

21502772076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30371213 (or 30371211 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 39.

The spelling of 21502772076 in words is "twenty-one billion, five hundred two million, seven hundred seventy-two thousand, seventy-six".