21463732 has 12 divisors (see below), whose sum is σ = 37595236. Its totient is φ = 10722240.

The previous prime is 21463721. The next prime is 21463759. The reversal of 21463732 is 23736412.

It can be written as a sum of positive squares in 2 ways, for example, as 10214416 + 11249316 = 3196^2 + 3354^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21463732.

It is a congruent number.

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, 5482 + ... + 8542.

Almost surely, 2^21463732 is an apocalyptic number.

It is an amenable number.

21463732 is a deficient number, since it is larger than the sum of its proper divisors (16131504).

21463732 is a wasteful number, since it uses less digits than its factorization.

21463732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4818 (or 4816 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 21463732 is about 4632.8967180372. The cubic root of 21463732 is about 277.9084459485.

The spelling of 21463732 in words is "twenty-one million, four hundred sixty-three thousand, seven hundred thirty-two".