311440320200021 has 2 divisors, whose sum is σ = 311440320200022. Its totient is φ = 311440320200020.

The previous prime is 311440320199999. The next prime is 311440320200111. The reversal of 311440320200021 is 120002023044113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 295063414308100 + 16376905891921 = 17177410^2 + 4046839^2 .

It is a cyclic number.

It is not a de Polignac number, because 311440320200021 - 2¹⁴ = 311440320183637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311440320200021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311440320230021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155720160100010 + 155720160100011.

It is an arithmetic number, because the mean of its divisors is an integer number (155720160100011).

Almost surely, 2^{311440320200021} is an apocalyptic number.

It is an amenable number.

311440320200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

311440320200021 is an equidigital number, since it uses as much as digits as its factorization.

311440320200021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 311440320200021 its reverse (120002023044113), we get a palindrome (431442343244134).

The spelling of 311440320200021 in words is "three hundred eleven trillion, four hundred forty billion, three hundred twenty million, two hundred thousand, twenty-one".