21333964 has 12 divisors (see below), whose sum is σ = 37503424. Its totient is φ = 10618704.

The previous prime is 21333947. The next prime is 21333967. The reversal of 21333964 is 46933312.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21333967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11067 + ... + 12850.

Almost surely, 2^21333964 is an apocalyptic number.

It is an amenable number.

21333964 is a deficient number, since it is larger than the sum of its proper divisors (16169460).

21333964 is a wasteful number, since it uses less digits than its factorization.

21333964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24144 (or 24142 counting only the distinct ones).

The product of its digits is 11664, while the sum is 31.

The square root of 21333964 is about 4618.8704246818. The cubic root of 21333964 is about 277.3472427123.

The spelling of 21333964 in words is "twenty-one million, three hundred thirty-three thousand, nine hundred sixty-four".