21052602 has 32 divisors (see below), whose sum is σ = 47044800. Its totient is φ = 6978384.

The previous prime is 21052597. The next prime is 21052609. The reversal of 21052602 is 20625012.

21052602 is a `hidden beast` number, since 2 + 10 + 52 + 602 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21052609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9649 + ... + 11627.

It is an arithmetic number, because the mean of its divisors is an integer number (1470150).

Almost surely, 2^21052602 is an apocalyptic number.

21052602 is an abundant number, since it is smaller than the sum of its proper divisors (25992198).

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

21052602 is a wasteful number, since it uses less digits than its factorization.

21052602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2187 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21052602 is about 4588.3114541190. The cubic root of 21052602 is about 276.1225825992.

Adding to 21052602 its reverse (20625012), we get a palindrome (41677614).

The spelling of 21052602 in words is "twenty-one million, fifty-two thousand, six hundred two".