21262562272 has 48 divisors (see below), whose sum is σ = 47851195392. Its totient is φ = 9110540160.

The previous prime is 21262562261. The next prime is 21262562341. The reversal of 21262562272 is 27226526212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1530397 + ... + 1544227.

It is an arithmetic number, because the mean of its divisors is an integer number (996899904).

Almost surely, 2^21262562272 is an apocalyptic number.

It is an amenable number.

21262562272 is an abundant number, since it is smaller than the sum of its proper divisors (26588633120).

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

21262562272 is a wasteful number, since it uses less digits than its factorization.

21262562272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20711 (or 20703 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The spelling of 21262562272 in words is "twenty-one billion, two hundred sixty-two million, five hundred sixty-two thousand, two hundred seventy-two".