21326984 has 16 divisors (see below), whose sum is σ = 45700800. Its totient is φ = 9140112.

The previous prime is 21326953. The next prime is 21326989. The reversal of 21326984 is 48962312.

It is not an unprimeable number, because it can be changed into a prime (21326989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190364 + ... + 190475.

It is an arithmetic number, because the mean of its divisors is an integer number (2856300).

Almost surely, 2^21326984 is an apocalyptic number.

It is an amenable number.

21326984 is an abundant number, since it is smaller than the sum of its proper divisors (24373816).

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

21326984 is a wasteful number, since it uses less digits than its factorization.

21326984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380852 (or 380848 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 21326984 is about 4618.1147668719. The cubic root of 21326984 is about 277.3169921235.

The spelling of 21326984 in words is "twenty-one million, three hundred twenty-six thousand, nine hundred eighty-four".