21319984 has 20 divisors (see below), whose sum is σ = 47208784. Its totient is φ = 9137088.

The previous prime is 21319981. The next prime is 21319997. The reversal of 21319984 is 48991312.

It is not an unprimeable number, because it can be changed into a prime (21319981) 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, 95067 + ... + 95290.

Almost surely, 2^21319984 is an apocalyptic number.

It is an amenable number.

21319984 is an abundant number, since it is smaller than the sum of its proper divisors (25888800).

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

21319984 is a wasteful number, since it uses less digits than its factorization.

21319984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190372 (or 190366 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 21319984 is about 4617.3568196534. The cubic root of 21319984 is about 277.2866482273.

The spelling of 21319984 in words is "twenty-one million, three hundred nineteen thousand, nine hundred eighty-four".