311321210999 has 2 divisors, whose sum is σ = 311321211000. Its totient is φ = 311321210998.

The previous prime is 311321210939. The next prime is 311321211001. The reversal of 311321210999 is 999012123113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311321210999 - 2²⁸ = 311052775543 is a prime.

Together with 311321211001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311321210909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155660605499 + 155660605500.

It is an arithmetic number, because the mean of its divisors is an integer number (155660605500).

Almost surely, 2^311321210999 is an apocalyptic number.

311321210999 is a deficient number, since it is larger than the sum of its proper divisors (1).

311321210999 is an equidigital number, since it uses as much as digits as its factorization.

311321210999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 41.

The spelling of 311321210999 in words is "three hundred eleven billion, three hundred twenty-one million, two hundred ten thousand, nine hundred ninety-nine".