21866052 has 24 divisors (see below), whose sum is σ = 54945856. Its totient is φ = 6727968.

The previous prime is 21866041. The next prime is 21866057. The reversal of 21866052 is 25066812.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21866057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69928 + ... + 70239.

Almost surely, 2^21866052 is an apocalyptic number.

It is an amenable number.

21866052 is an abundant number, since it is smaller than the sum of its proper divisors (33079804).

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

21866052 is a wasteful number, since it uses less digits than its factorization.

21866052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140187 (or 140185 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 21866052 is about 4676.1150541876. The cubic root of 21866052 is about 279.6340968772.

The spelling of 21866052 in words is "twenty-one million, eight hundred sixty-six thousand, fifty-two".