21187052 has 24 divisors (see below), whose sum is σ = 40378800. Its totient is φ = 9688896.

The previous prime is 21187027. The next prime is 21187063. The reversal of 21187052 is 25078112.

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, 2603 + ... + 7010.

It is an arithmetic number, because the mean of its divisors is an integer number (1682450).

Almost surely, 2^21187052 is an apocalyptic number.

It is an amenable number.

21187052 is a deficient number, since it is larger than the sum of its proper divisors (19191748).

21187052 is a wasteful number, since it uses less digits than its factorization.

21187052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9665 (or 9663 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 21187052 is about 4602.9394955832. The cubic root of 21187052 is about 276.7091439756.

The spelling of 21187052 in words is "twenty-one million, one hundred eighty-seven thousand, fifty-two".