21879414 has 24 divisors (see below), whose sum is σ = 48057672. Its totient is φ = 7192800.

The previous prime is 21879379. The next prime is 21879443. The reversal of 21879414 is 41497812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7012 + ... + 9639.

It is an arithmetic number, because the mean of its divisors is an integer number (2002403).

Almost surely, 2^21879414 is an apocalyptic number.

21879414 is an abundant number, since it is smaller than the sum of its proper divisors (26178258).

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

21879414 is a wasteful number, since it uses less digits than its factorization.

21879414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16732 (or 16729 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 21879414 is about 4677.5435861144. The cubic root of 21879414 is about 279.6910452762.

The spelling of 21879414 in words is "twenty-one million, eight hundred seventy-nine thousand, four hundred fourteen".