21855752 has 32 divisors (see below), whose sum is σ = 43009920. Its totient is φ = 10399680.

The previous prime is 21855737. The next prime is 21855781. The reversal of 21855752 is 25755812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13127 + ... + 14697.

It is an arithmetic number, because the mean of its divisors is an integer number (1344060).

Almost surely, 2^21855752 is an apocalyptic number.

It is an amenable number.

21855752 is a deficient number, since it is larger than the sum of its proper divisors (21154168).

21855752 is a wasteful number, since it uses less digits than its factorization.

21855752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661 (or 1657 counting only the distinct ones).

The product of its digits is 28000, while the sum is 35.

The square root of 21855752 is about 4675.0135828680. The cubic root of 21855752 is about 279.5901827836.

The spelling of 21855752 in words is "twenty-one million, eight hundred fifty-five thousand, seven hundred fifty-two".