21162968 has 8 divisors (see below), whose sum is σ = 39680580. Its totient is φ = 10581480.

The previous prime is 21162959. The next prime is 21162989. The reversal of 21162968 is 86926112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a zygodrome in base 13.

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 as a sum of consecutive naturals, namely, 1322678 + ... + 1322693.

Almost surely, 2^21162968 is an apocalyptic number.

It is an amenable number.

21162968 is a deficient number, since it is larger than the sum of its proper divisors (18517612).

21162968 is a wasteful number, since it uses less digits than its factorization.

21162968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645377 (or 2645373 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 21162968 is about 4600.3225973838. The cubic root of 21162968 is about 276.6042561762.

The spelling of 21162968 in words is "twenty-one million, one hundred sixty-two thousand, nine hundred sixty-eight".