21532964 has 36 divisors (see below), whose sum is σ = 40313364. Its totient is φ = 10055808.

The previous prime is 21532961. The next prime is 21532967. The reversal of 21532964 is 46923512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21532961) and next prime (21532967).

It can be written as a sum of positive squares in 6 ways, for example, as 4804864 + 16728100 = 2192^2 + 4090^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21532964.

It is not an unprimeable number, because it can be changed into a prime (21532961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124382 + ... + 124554.

Almost surely, 2^21532964 is an apocalyptic number.

It is an amenable number.

21532964 is a deficient number, since it is larger than the sum of its proper divisors (18780400).

21532964 is a wasteful number, since it uses less digits than its factorization.

21532964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 241 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 21532964 is about 4640.3624858409. The cubic root of 21532964 is about 278.2069263173.

The spelling of 21532964 in words is "twenty-one million, five hundred thirty-two thousand, nine hundred sixty-four".