21764982 has 16 divisors (see below), whose sum is σ = 44268480. Its totient is φ = 7131912.

The previous prime is 21764959. The next prime is 21765019. The reversal of 21764982 is 28946712.

It is a self number, because there is not a number n which added to its sum of digits gives 21764982.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30388 + ... + 31095.

It is an arithmetic number, because the mean of its divisors is an integer number (2766780).

Almost surely, 2^21764982 is an apocalyptic number.

21764982 is an abundant number, since it is smaller than the sum of its proper divisors (22503498).

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

21764982 is a wasteful number, since it uses less digits than its factorization.

21764982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61547.

The product of its digits is 48384, while the sum is 39.

The square root of 21764982 is about 4665.2954890339. The cubic root of 21764982 is about 279.2025866406.

The spelling of 21764982 in words is "twenty-one million, seven hundred sixty-four thousand, nine hundred eighty-two".