21274688604 has 48 divisors (see below), whose sum is σ = 54763380000. Its totient is φ = 6386396160.

The previous prime is 21274688599. The next prime is 21274688609. The reversal of 21274688604 is 40688647212.

It is an interprime number because it is at equal distance from previous prime (21274688599) and next prime (21274688609).

It is a super-2 number, since 2×21274688604² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21274688609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1656729 + ... + 1669520.

It is an arithmetic number, because the mean of its divisors is an integer number (1140903750).

Almost surely, 2^21274688604 is an apocalyptic number.

It is an amenable number.

21274688604 is an abundant number, since it is smaller than the sum of its proper divisors (33488691396).

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

21274688604 is a wasteful number, since it uses less digits than its factorization.

21274688604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3326310 (or 3326308 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 48.

The spelling of 21274688604 in words is "twenty-one billion, two hundred seventy-four million, six hundred eighty-eight thousand, six hundred four".