21520552 has 16 divisors (see below), whose sum is σ = 41742900. Its totient is φ = 10389120.

The previous prime is 21520547. The next prime is 21520561. The reversal of 21520552 is 25502512.

It can be written as a sum of positive squares in 2 ways, for example, as 20921476 + 599076 = 4574^2 + 774^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46149 + ... + 46612.

Almost surely, 2^21520552 is an apocalyptic number.

It is an amenable number.

21520552 is a deficient number, since it is larger than the sum of its proper divisors (20222348).

21520552 is a wasteful number, since it uses less digits than its factorization.

21520552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92796 (or 92792 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 21520552 is about 4639.0248975404. The cubic root of 21520552 is about 278.1534614984.

The spelling of 21520552 in words is "twenty-one million, five hundred twenty thousand, five hundred fifty-two".