21879676 has 72 divisors (see below), whose sum is σ = 49693056. Its totient is φ = 8346240.

The previous prime is 21879661. The next prime is 21879701. The reversal of 21879676 is 67697812.

It is a happy number.

It is a congruent number.

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, 78850 + ... + 79126.

Almost surely, 2^21879676 is an apocalyptic number.

21879676 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21879676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24846528).

21879676 is an abundant number, since it is smaller than the sum of its proper divisors (27813380).

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

21879676 is a wasteful number, since it uses less digits than its factorization.

21879676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 330 counting only the distinct ones).

The product of its digits is 254016, while the sum is 46.

The square root of 21879676 is about 4677.5715921833. The cubic root of 21879676 is about 279.6921616796.

The spelling of 21879676 in words is "twenty-one million, eight hundred seventy-nine thousand, six hundred seventy-six".