21272251968 has 112 divisors (see below), whose sum is σ = 68221677120. Its totient is φ = 6446131200.

The previous prime is 21272251967. The next prime is 21272252003. The reversal of 21272251968 is 86915227212.

21272251968 is a `hidden beast` number, since 2 + 1 + 2 + 72 + 2 + 519 + 68 = 666.

It is a super-3 number, since 3×21272251968³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21272251967) 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, 540553 + ... + 578568.

Almost surely, 2^21272251968 is an apocalyptic number.

It is an amenable number.

21272251968 is an abundant number, since it is smaller than the sum of its proper divisors (46949425152).

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

21272251968 is a wasteful number, since it uses less digits than its factorization.

21272251968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119153 (or 1119137 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The spelling of 21272251968 in words is "twenty-one billion, two hundred seventy-two million, two hundred fifty-one thousand, nine hundred sixty-eight".