311221202122139 has 2 divisors, whose sum is σ = 311221202122140. Its totient is φ = 311221202122138.

The previous prime is 311221202122079. The next prime is 311221202122231. The reversal of 311221202122139 is 931221202122113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311221202122139 is a prime.

It is a super-3 number, since 3×311221202122139³ (a number of 44 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (311221202122739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155610601061069 + 155610601061070.

It is an arithmetic number, because the mean of its divisors is an integer number (155610601061070).

Almost surely, 2^{311221202122139} is an apocalyptic number.

311221202122139 is a deficient number, since it is larger than the sum of its proper divisors (1).

311221202122139 is an equidigital number, since it uses as much as digits as its factorization.

311221202122139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 311221202122139 in words is "three hundred eleven trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty-two thousand, one hundred thirty-nine".