21162810979 has 2 divisors, whose sum is σ = 21162810980. Its totient is φ = 21162810978.

The previous prime is 21162810967. The next prime is 21162811003. The reversal of 21162810979 is 97901826112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21162810979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21162817979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581405489 + 10581405490.

It is an arithmetic number, because the mean of its divisors is an integer number (10581405490).

Almost surely, 2^21162810979 is an apocalyptic number.

21162810979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21162810979 is an equidigital number, since it uses as much as digits as its factorization.

21162810979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The spelling of 21162810979 in words is "twenty-one billion, one hundred sixty-two million, eight hundred ten thousand, nine hundred seventy-nine".