21572713026 has 48 divisors (see below), whose sum is σ = 48543651000. Its totient is φ = 6917923584.

The previous prime is 21572713021. The next prime is 21572713049. The reversal of 21572713026 is 62031727512.

21572713026 is a `hidden beast` number, since 215 + 72 + 71 + 302 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12538400625 + 9034312401 = 111975^2 + 95049^2 .

It is not an unprimeable number, because it can be changed into a prime (21572713021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122701 + ... + 241248.

Almost surely, 2^21572713026 is an apocalyptic number.

21572713026 is an abundant number, since it is smaller than the sum of its proper divisors (26970937974).

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

21572713026 is a wasteful number, since it uses less digits than its factorization.

21572713026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364083 (or 364080 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 21572713026 in words is "twenty-one billion, five hundred seventy-two million, seven hundred thirteen thousand, twenty-six".