21955952 has 20 divisors (see below), whose sum is σ = 42623760. Its totient is φ = 10956288.

The previous prime is 21955943. The next prime is 21955957. The reversal of 21955952 is 25955912.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21955957) by changing a digit.

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, 9749 + ... + 11787.

It is an arithmetic number, because the mean of its divisors is an integer number (2131188).

Almost surely, 2^21955952 is an apocalyptic number.

It is an amenable number.

21955952 is a deficient number, since it is larger than the sum of its proper divisors (20667808).

21955952 is a wasteful number, since it uses less digits than its factorization.

21955952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720 (or 2714 counting only the distinct ones).

The product of its digits is 40500, while the sum is 38.

The square root of 21955952 is about 4685.7178745631. The cubic root of 21955952 is about 280.0168017129.

The spelling of 21955952 in words is "twenty-one million, nine hundred fifty-five thousand, nine hundred fifty-two".