21183272 has 16 divisors (see below), whose sum is σ = 43329600. Its totient is φ = 9628720.

The previous prime is 21183269. The next prime is 21183313. The reversal of 21183272 is 27238112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120272 + ... + 120447.

It is an arithmetic number, because the mean of its divisors is an integer number (2708100).

Almost surely, 2^21183272 is an apocalyptic number.

21183272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21183272 is an abundant number, since it is smaller than the sum of its proper divisors (22146328).

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

21183272 is a wasteful number, since it uses less digits than its factorization.

21183272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240736 (or 240732 counting only the distinct ones).

The product of its digits is 1344, while the sum is 26.

The square root of 21183272 is about 4602.5288700887. The cubic root of 21183272 is about 276.6926870255.

The spelling of 21183272 in words is "twenty-one million, one hundred eighty-three thousand, two hundred seventy-two".