21906876 has 24 divisors (see below), whose sum is σ = 51192064. Its totient is φ = 7291440.

The previous prime is 21906847. The next prime is 21906883. The reversal of 21906876 is 67860912.

It is a super-2 number, since 2×21906876² = 959822432158752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14031 + ... + 15513.

Almost surely, 2^21906876 is an apocalyptic number.

It is an amenable number.

21906876 is an abundant number, since it is smaller than the sum of its proper divisors (29285188).

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

21906876 is a wasteful number, since it uses less digits than its factorization.

21906876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721 (or 2719 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 21906876 is about 4680.4781806991. The cubic root of 21906876 is about 279.8080146515.

The spelling of 21906876 in words is "twenty-one million, nine hundred six thousand, eight hundred seventy-six".