21658052 has 12 divisors (see below), whose sum is σ = 40817196. Its totient is φ = 9996000.

The previous prime is 21658031. The next prime is 21658067. The reversal of 21658052 is 25085612.

It can be written as a sum of positive squares in 2 ways, for example, as 5125696 + 16532356 = 2264^2 + 4066^2 .

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, 208199 + ... + 208302.

It is an arithmetic number, because the mean of its divisors is an integer number (3401433).

Almost surely, 2^21658052 is an apocalyptic number.

It is an amenable number.

21658052 is a deficient number, since it is larger than the sum of its proper divisors (19159144).

21658052 is a wasteful number, since it uses less digits than its factorization.

21658052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416518 (or 416516 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 21658052 is about 4653.8212256166. The cubic root of 21658052 is about 278.7446008325.

The spelling of 21658052 in words is "twenty-one million, six hundred fifty-eight thousand, fifty-two".