21952944 has 100 divisors (see below), whose sum is σ = 68478256. Its totient is φ = 6749568.

The previous prime is 21952939. The next prime is 21952963. The reversal of 21952944 is 44925912.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21952899 and 21952908.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16197 + ... + 17499.

Almost surely, 2^21952944 is an apocalyptic number.

21952944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21952944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34239128).

21952944 is an abundant number, since it is smaller than the sum of its proper divisors (46525312).

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

21952944 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (21952943) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1321).

21952944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 1321 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 21952944 is about 4685.3968882049. The cubic root of 21952944 is about 280.0040135479.

The spelling of 21952944 in words is "twenty-one million, nine hundred fifty-two thousand, nine hundred forty-four".