21893874 has 16 divisors (see below), whose sum is σ = 45200640. Its totient is φ = 7062480.

The previous prime is 21893831. The next prime is 21893887. The reversal of 21893874 is 47839812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58669 + ... + 59040.

It is an arithmetic number, because the mean of its divisors is an integer number (2825040).

Almost surely, 2^21893874 is an apocalyptic number.

21893874 is an abundant number, since it is smaller than the sum of its proper divisors (23306766).

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

21893874 is a wasteful number, since it uses less digits than its factorization.

21893874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117745.

The product of its digits is 96768, while the sum is 42.

The square root of 21893874 is about 4679.0890139000. The cubic root of 21893874 is about 279.7526471984.

The spelling of 21893874 in words is "twenty-one million, eight hundred ninety-three thousand, eight hundred seventy-four".