21966982 has 4 divisors (see below), whose sum is σ = 32950476. Its totient is φ = 10983490.

The previous prime is 21966961. The next prime is 21967019. The reversal of 21966982 is 28966912.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5491744 + ... + 5491747.

It is an arithmetic number, because the mean of its divisors is an integer number (8237619).

Almost surely, 2^21966982 is an apocalyptic number.

21966982 is a deficient number, since it is larger than the sum of its proper divisors (10983494).

21966982 is a wasteful number, since it uses less digits than its factorization.

21966982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10983493.

The product of its digits is 93312, while the sum is 43.

The square root of 21966982 is about 4686.8947075863. The cubic root of 21966982 is about 280.0636844938.

The spelling of 21966982 in words is "twenty-one million, nine hundred sixty-six thousand, nine hundred eighty-two".