21725952 has 36 divisors (see below), whose sum is σ = 57824760. Its totient is φ = 7241728.

The previous prime is 21725933. The next prime is 21725953. The reversal of 21725952 is 25952712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21725953) 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, 13377 + ... + 14912.

Almost surely, 2^21725952 is an apocalyptic number.

It is an amenable number.

21725952 is an abundant number, since it is smaller than the sum of its proper divisors (36098808).

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

21725952 is an equidigital number, since it uses as much as digits as its factorization.

21725952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28308 (or 28294 counting only the distinct ones).

The product of its digits is 12600, while the sum is 33.

The square root of 21725952 is about 4661.1105972719. The cubic root of 21725952 is about 279.0355936655.

The spelling of 21725952 in words is "twenty-one million, seven hundred twenty-five thousand, nine hundred fifty-two".