311322021213 has 24 divisors (see below), whose sum is σ = 482978829600. Its totient is φ = 177857027040.

The previous prime is 311322021209. The next prime is 311322021217. The reversal of 311322021213 is 312120223113.

It is an interprime number because it is at equal distance from previous prime (311322021209) and next prime (311322021217).

It is not a de Polignac number, because 311322021213 - 2² = 311322021209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 311322021213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311322021217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 395818 + ... + 882788.

It is an arithmetic number, because the mean of its divisors is an integer number (20124117900).

Almost surely, 2^311322021213 is an apocalyptic number.

It is an amenable number.

311322021213 is a deficient number, since it is larger than the sum of its proper divisors (171656808387).

311322021213 is a wasteful number, since it uses less digits than its factorization.

311322021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491337 (or 491330 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 311322021213 its reverse (312120223113), we get a palindrome (623442244326).

The spelling of 311322021213 in words is "three hundred eleven billion, three hundred twenty-two million, twenty-one thousand, two hundred thirteen".