21966124 has 6 divisors (see below), whose sum is σ = 38440724. Its totient is φ = 10983060.

The previous prime is 21966107. The next prime is 21966143. The reversal of 21966124 is 42166912.

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 as a sum of consecutive naturals, namely, 2745762 + ... + 2745769.

Almost surely, 2^21966124 is an apocalyptic number.

It is an amenable number.

21966124 is a deficient number, since it is larger than the sum of its proper divisors (16474600).

21966124 is a wasteful number, since it uses less digits than its factorization.

21966124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491535 (or 5491533 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 21966124 is about 4686.8031748730. The cubic root of 21966124 is about 280.0600381460.

The spelling of 21966124 in words is "twenty-one million, nine hundred sixty-six thousand, one hundred twenty-four".