21274767072 has 96 divisors (see below), whose sum is σ = 66824624160. Its totient is φ = 6546078720.

The previous prime is 21274767067. The next prime is 21274767083. The reversal of 21274767072 is 27076747212.

21274767072 is a `hidden beast` number, since 21 + 27 + 476 + 70 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is a congruent number.

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, 935829 + ... + 958292.

It is an arithmetic number, because the mean of its divisors is an integer number (696089835).

Almost surely, 2^21274767072 is an apocalyptic number.

It is an amenable number.

21274767072 is an abundant number, since it is smaller than the sum of its proper divisors (45549857088).

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

21274767072 is a wasteful number, since it uses less digits than its factorization.

21274767072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894153 (or 1894139 counting only the distinct ones).

The product of its (nonzero) digits is 460992, while the sum is 45.

The spelling of 21274767072 in words is "twenty-one billion, two hundred seventy-four million, seven hundred sixty-seven thousand, seventy-two".