21132204 has 24 divisors (see below), whose sum is σ = 50899968. Its totient is φ = 6816720.

The previous prime is 21132197. The next prime is 21132211. The reversal of 21132204 is 40223112.

It is an interprime number because it is at equal distance from previous prime (21132197) and next prime (21132211).

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, 28032 + ... + 28775.

It is an arithmetic number, because the mean of its divisors is an integer number (2120832).

Almost surely, 2^21132204 is an apocalyptic number.

It is an amenable number.

21132204 is an abundant number, since it is smaller than the sum of its proper divisors (29767764).

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

21132204 is a wasteful number, since it uses less digits than its factorization.

21132204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56845 (or 56843 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21132204 is about 4596.9777027956. The cubic root of 21132204 is about 276.4701606186.

Adding to 21132204 its reverse (40223112), we get a palindrome (61355316).

The spelling of 21132204 in words is "twenty-one million, one hundred thirty-two thousand, two hundred four".