21679254 has 24 divisors (see below), whose sum is σ = 47063952. Its totient is φ = 7212240.

The previous prime is 21679249. The next prime is 21679297. The reversal of 21679254 is 45297612.

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, 12564 + ... + 14184.

It is an arithmetic number, because the mean of its divisors is an integer number (1960998).

Almost surely, 2^21679254 is an apocalyptic number.

21679254 is an abundant number, since it is smaller than the sum of its proper divisors (25384698).

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

21679254 is a wasteful number, since it uses less digits than its factorization.

21679254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372 (or 2369 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 21679254 is about 4656.0985814306. The cubic root of 21679254 is about 278.8355295331.

The spelling of 21679254 in words is "twenty-one million, six hundred seventy-nine thousand, two hundred fifty-four".