21022522500 has 120 divisors (see below), whose sum is σ = 70052825920. Its totient is φ = 4805136000.

The previous prime is 21022522481. The next prime is 21022522513. The reversal of 21022522500 is 522522012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 147715 + ... + 252714.

Almost surely, 2^21022522500 is an apocalyptic number.

21022522500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022522500 is an abundant number, since it is smaller than the sum of its proper divisors (49030303420).

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

21022522500 is a wasteful number, since it uses less digits than its factorization.

21022522500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400463 (or 400446 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The spelling of 21022522500 in words is "twenty-one billion, twenty-two million, five hundred twenty-two thousand, five hundred".