21274745672 has 32 divisors (see below), whose sum is σ = 40303467000. Its totient is φ = 10527673344.

The previous prime is 21274745669. The next prime is 21274745731. The reversal of 21274745672 is 27654747212.

It can be written as a sum of positive squares in 4 ways, for example, as 10018808836 + 11255936836 = 100094^2 + 106094^2 .

It is a super-2 number, since 2×21274745672² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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, 297968 + ... + 362400.

Almost surely, 2^21274745672 is an apocalyptic number.

It is an amenable number.

21274745672 is a deficient number, since it is larger than the sum of its proper divisors (19028721328).

21274745672 is a wasteful number, since it uses less digits than its factorization.

21274745672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64865 (or 64861 counting only the distinct ones).

The product of its digits is 1317120, while the sum is 47.

The spelling of 21274745672 in words is "twenty-one billion, two hundred seventy-four million, seven hundred forty-five thousand, six hundred seventy-two".