21525752 has 8 divisors (see below), whose sum is σ = 40360800. Its totient is φ = 10762872.

The previous prime is 21525733. The next prime is 21525767. The reversal of 21525752 is 25752512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345352 + ... + 1345367.

It is an arithmetic number, because the mean of its divisors is an integer number (5045100).

Almost surely, 2^21525752 is an apocalyptic number.

It is an amenable number.

21525752 is a deficient number, since it is larger than the sum of its proper divisors (18835048).

21525752 is a wasteful number, since it uses less digits than its factorization.

21525752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690725 (or 2690721 counting only the distinct ones).

The product of its digits is 7000, while the sum is 29.

The square root of 21525752 is about 4639.5853262980. The cubic root of 21525752 is about 278.1758630539.

The spelling of 21525752 in words is "twenty-one million, five hundred twenty-five thousand, seven hundred fifty-two".