21274691556 has 48 divisors (see below), whose sum is σ = 50914459008. Its totient is φ = 6910060800.

The previous prime is 21274691539. The next prime is 21274691569. The reversal of 21274691556 is 65519647212.

It is a super-2 number, since 2×21274691556² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378646 + ... + 431186.

It is an arithmetic number, because the mean of its divisors is an integer number (1060717896).

Almost surely, 2^21274691556 is an apocalyptic number.

It is an amenable number.

21274691556 is an abundant number, since it is smaller than the sum of its proper divisors (29639767452).

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

21274691556 is a wasteful number, since it uses less digits than its factorization.

21274691556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53412 (or 53410 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The spelling of 21274691556 in words is "twenty-one billion, two hundred seventy-four million, six hundred ninety-one thousand, five hundred fifty-six".