21265572076 has 24 divisors (see below), whose sum is σ = 43903118336. Its totient is φ = 8819822160.

The previous prime is 21265572059. The next prime is 21265572109. The reversal of 21265572076 is 67027556212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12248886 + ... + 12250621.

Almost surely, 2^21265572076 is an apocalyptic number.

It is an amenable number.

21265572076 is an abundant number, since it is smaller than the sum of its proper divisors (22637546260).

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

21265572076 is a wasteful number, since it uses less digits than its factorization.

21265572076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24499549 (or 24499547 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 21265572076 in words is "twenty-one billion, two hundred sixty-five million, five hundred seventy-two thousand, seventy-six".