21465132 has 24 divisors (see below), whose sum is σ = 53938416. Its totient is φ = 6604608.

The previous prime is 21465131. The next prime is 21465137. The reversal of 21465132 is 23156412.

It is not an unprimeable number, because it can be changed into a prime (21465131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68643 + ... + 68954.

It is an arithmetic number, because the mean of its divisors is an integer number (2247434).

Almost surely, 2^21465132 is an apocalyptic number.

It is an amenable number.

21465132 is an abundant number, since it is smaller than the sum of its proper divisors (32473284).

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

21465132 is a wasteful number, since it uses less digits than its factorization.

21465132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137617 (or 137615 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 21465132 is about 4633.0478089482. The cubic root of 21465132 is about 277.9144881312.

The spelling of 21465132 in words is "twenty-one million, four hundred sixty-five thousand, one hundred thirty-two".