311402050021 has 2 divisors, whose sum is σ = 311402050022. Its totient is φ = 311402050020.

The previous prime is 311402050009. The next prime is 311402050079. The reversal of 311402050021 is 120050204113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304940301796 + 6461748225 = 552214^2 + 80385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311402050021 is a prime.

It is a super-2 number, since 2×311402050021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311402050081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155701025010 + 155701025011.

It is an arithmetic number, because the mean of its divisors is an integer number (155701025011).

Almost surely, 2^311402050021 is an apocalyptic number.

It is an amenable number.

311402050021 is a deficient number, since it is larger than the sum of its proper divisors (1).

311402050021 is an equidigital number, since it uses as much as digits as its factorization.

311402050021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 311402050021 its reverse (120050204113), we get a palindrome (431452254134).

The spelling of 311402050021 in words is "three hundred eleven billion, four hundred two million, fifty thousand, twenty-one".