311442421421 has 2 divisors, whose sum is σ = 311442421422. Its totient is φ = 311442421420.

The previous prime is 311442421403. The next prime is 311442421439. The reversal of 311442421421 is 124124244113.

It is a balanced prime because it is at equal distance from previous prime (311442421403) and next prime (311442421439).

It can be written as a sum of positive squares in only one way, i.e., 266292121225 + 45150300196 = 516035^2 + 212486^2 .

It is an emirp because it is prime and its reverse (124124244113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 311442421421 - 2¹⁰ = 311442420397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311442421441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155721210710 + 155721210711.

It is an arithmetic number, because the mean of its divisors is an integer number (155721210711).

Almost surely, 2^311442421421 is an apocalyptic number.

It is an amenable number.

311442421421 is a deficient number, since it is larger than the sum of its proper divisors (1).

311442421421 is an equidigital number, since it uses as much as digits as its factorization.

311442421421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 29.

Adding to 311442421421 its reverse (124124244113), we get a palindrome (435566665534).

The spelling of 311442421421 in words is "three hundred eleven billion, four hundred forty-two million, four hundred twenty-one thousand, four hundred twenty-one".