21669858252 has 72 divisors (see below), whose sum is σ = 63221706912. Its totient is φ = 6130080000.

The previous prime is 21669858209. The next prime is 21669858263. The reversal of 21669858252 is 25285896612.

21669858252 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 9 + 8 + 582 + 52 = 666.

It is a super-3 number, since 3×21669858252³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 400249 + ... + 451152.

Almost surely, 2^21669858252 is an apocalyptic number.

It is an amenable number.

21669858252 is an abundant number, since it is smaller than the sum of its proper divisors (41551848660).

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

21669858252 is a wasteful number, since it uses less digits than its factorization.

21669858252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851519 (or 851514 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 21669858252 in words is "twenty-one billion, six hundred sixty-nine million, eight hundred fifty-eight thousand, two hundred fifty-two".