21068984 has 64 divisors (see below), whose sum is σ = 44323200. Its totient is φ = 9345024.

The previous prime is 21068977. The next prime is 21069007. The reversal of 21068984 is 48986012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266657 + ... + 266735.

It is an arithmetic number, because the mean of its divisors is an integer number (692550).

Almost surely, 2^21068984 is an apocalyptic number.

It is an amenable number.

21068984 is an abundant number, since it is smaller than the sum of its proper divisors (23254216).

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

21068984 is a wasteful number, since it uses less digits than its factorization.

21068984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21068984 is about 4590.0962952862. The cubic root of 21068984 is about 276.1941852662.

The spelling of 21068984 in words is "twenty-one million, sixty-eight thousand, nine hundred eighty-four".