21272132 has 12 divisors (see below), whose sum is σ = 42544320. Its totient is φ = 9116616.

The previous prime is 21272129. The next prime is 21272149. The reversal of 21272132 is 23127212.

21272132 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379832 + ... + 379887.

It is an arithmetic number, because the mean of its divisors is an integer number (3545360).

Almost surely, 2^21272132 is an apocalyptic number.

It is an amenable number.

21272132 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21272132 is a wasteful number, since it uses less digits than its factorization.

21272132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759730 (or 759728 counting only the distinct ones).

The product of its digits is 336, while the sum is 20.

The square root of 21272132 is about 4612.1721563706. The cubic root of 21272132 is about 277.0790392510.

Adding to 21272132 its reverse (23127212), we get a palindrome (44399344).

The spelling of 21272132 in words is "twenty-one million, two hundred seventy-two thousand, one hundred thirty-two".