312311221099 has 2 divisors, whose sum is σ = 312311221100. Its totient is φ = 312311221098.

The previous prime is 312311221051. The next prime is 312311221121. The reversal of 312311221099 is 990122113213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 312311221099 - 2⁷ = 312311220971 is a prime.

It is not a weakly prime, because it can be changed into another prime (312311221009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156155610549 + 156155610550.

It is an arithmetic number, because the mean of its divisors is an integer number (156155610550).

Almost surely, 2^312311221099 is an apocalyptic number.

312311221099 is a deficient number, since it is larger than the sum of its proper divisors (1).

312311221099 is an equidigital number, since it uses as much as digits as its factorization.

312311221099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The spelling of 312311221099 in words is "three hundred twelve billion, three hundred eleven million, two hundred twenty-one thousand, ninety-nine".