21923952 has 40 divisors (see below), whose sum is σ = 57329664. Its totient is φ = 7218624.

The previous prime is 21923947. The next prime is 21923953. The reversal of 21923952 is 25932912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21923953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1233 + ... + 6735.

Almost surely, 2^21923952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21923952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28664832).

21923952 is an abundant number, since it is smaller than the sum of its proper divisors (35405712).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21923952 is a wasteful number, since it uses less digits than its factorization.

21923952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5597 (or 5591 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 21923952 is about 4682.3019979493. The cubic root of 21923952 is about 279.8806974741.

The spelling of 21923952 in words is "twenty-one million, nine hundred twenty-three thousand, nine hundred fifty-two".