21567052 has 48 divisors (see below), whose sum is σ = 43464960. Its totient is φ = 9281088.

The previous prime is 21567011. The next prime is 21567083. The reversal of 21567052 is 25076512.

It is a self number, because there is not a number n which added to its sum of digits gives 21567052.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81873 + ... + 82135.

It is an arithmetic number, because the mean of its divisors is an integer number (905520).

Almost surely, 2^21567052 is an apocalyptic number.

It is an amenable number.

21567052 is an abundant number, since it is smaller than the sum of its proper divisors (21897908).

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

21567052 is a wasteful number, since it uses less digits than its factorization.

21567052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21567052 is about 4644.0340222699. The cubic root of 21567052 is about 278.3536551152.

The spelling of 21567052 in words is "twenty-one million, five hundred sixty-seven thousand, fifty-two".