21994984 has 16 divisors (see below), whose sum is σ = 44989920. Its totient is φ = 9997680.

The previous prime is 21994981. The next prime is 21994993. The reversal of 21994984 is 48949912.

It is not an unprimeable number, because it can be changed into a prime (21994981) 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, 124884 + ... + 125059.

It is an arithmetic number, because the mean of its divisors is an integer number (2811870).

Almost surely, 2^21994984 is an apocalyptic number.

It is an amenable number.

21994984 is an abundant number, since it is smaller than the sum of its proper divisors (22994936).

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

21994984 is a wasteful number, since it uses less digits than its factorization.

21994984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249960 (or 249956 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 21994984 is about 4689.8810219450. The cubic root of 21994984 is about 280.1826359480.

The spelling of 21994984 in words is "twenty-one million, nine hundred ninety-four thousand, nine hundred eighty-four".