21525652 has 6 divisors (see below), whose sum is σ = 37669898. Its totient is φ = 10762824.

The previous prime is 21525643. The next prime is 21525653. The reversal of 21525652 is 25652512.

It can be written as a sum of positive squares in only one way, i.e., 20830096 + 695556 = 4564^2 + 834^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21525652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21525653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2690703 + ... + 2690710.

Almost surely, 2^21525652 is an apocalyptic number.

It is an amenable number.

21525652 is a deficient number, since it is larger than the sum of its proper divisors (16144246).

21525652 is a wasteful number, since it uses less digits than its factorization.

21525652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381417 (or 5381415 counting only the distinct ones).

The product of its digits is 6000, while the sum is 28.

The square root of 21525652 is about 4639.5745494603. The cubic root of 21525652 is about 278.1754322887.

The spelling of 21525652 in words is "twenty-one million, five hundred twenty-five thousand, six hundred fifty-two".