21954664 has 16 divisors (see below), whose sum is σ = 41261220. Its totient is φ = 10951680.

The previous prime is 21954643. The next prime is 21954679. The reversal of 21954664 is 46645912.

It can be written as a sum of positive squares in 2 ways, for example, as 17994564 + 3960100 = 4242^2 + 1990^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 712 + ... + 6664.

Almost surely, 2^21954664 is an apocalyptic number.

It is an amenable number.

21954664 is a deficient number, since it is larger than the sum of its proper divisors (19306556).

21954664 is a wasteful number, since it uses less digits than its factorization.

21954664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6420 (or 6416 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 21954664 is about 4685.5804336283. The cubic root of 21954664 is about 280.0113260725.

It can be divided in two parts, 2195 and 4664, that added together give a cube (6859 = 19³).

The spelling of 21954664 in words is "twenty-one million, nine hundred fifty-four thousand, six hundred sixty-four".