21031022311979 has 2 divisors, whose sum is σ = 21031022311980. Its totient is φ = 21031022311978.

The previous prime is 21031022311961. The next prime is 21031022312039. The reversal of 21031022311979 is 97911322013012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21031022311979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21031022311909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515511155989 + 10515511155990.

It is an arithmetic number, because the mean of its divisors is an integer number (10515511155990).

Almost surely, 2^{21031022311979} is an apocalyptic number.

21031022311979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031022311979 is an equidigital number, since it uses as much as digits as its factorization.

21031022311979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The spelling of 21031022311979 in words is "twenty-one trillion, thirty-one billion, twenty-two million, three hundred eleven thousand, nine hundred seventy-nine".