21167272 has 32 divisors (see below), whose sum is σ = 45515520. Its totient is φ = 9040320.

The previous prime is 21167257. The next prime is 21167297. The reversal of 21167272 is 27276112.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a pancake number, because a pancake can be divided into 21167272 parts by 6506 straight cuts.

It is a self number, because there is not a number n which added to its sum of digits gives 21167272.

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, 23698 + ... + 24574.

It is an arithmetic number, because the mean of its divisors is an integer number (1422360).

Almost surely, 2^21167272 is an apocalyptic number.

It is an amenable number.

21167272 is an abundant number, since it is smaller than the sum of its proper divisors (24348248).

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

21167272 is a wasteful number, since it uses less digits than its factorization.

21167272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 1317 counting only the distinct ones).

The product of its digits is 2352, while the sum is 28.

The square root of 21167272 is about 4600.7903668826. The cubic root of 21167272 is about 276.6230062876.

The spelling of 21167272 in words is "twenty-one million, one hundred sixty-seven thousand, two hundred seventy-two".