21312021301979 has 2 divisors, whose sum is σ = 21312021301980. Its totient is φ = 21312021301978.

The previous prime is 21312021301903. The next prime is 21312021302027. The reversal of 21312021301979 is 97910312021312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21312021301979 is a prime.

It is not a weakly prime, because it can be changed into another prime (21312021301079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656010650989 + 10656010650990.

It is an arithmetic number, because the mean of its divisors is an integer number (10656010650990).

Almost surely, 2^{21312021301979} is an apocalyptic number.

21312021301979 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312021301979 is an equidigital number, since it uses as much as digits as its factorization.

21312021301979 is an evil number, because the sum of its binary digits is even.

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

The spelling of 21312021301979 in words is "twenty-one trillion, three hundred twelve billion, twenty-one million, three hundred one thousand, nine hundred seventy-nine".