311210121213 has 6 divisors (see below), whose sum is σ = 449525730654. Its totient is φ = 207473414136.

The previous prime is 311210121163. The next prime is 311210121247. The reversal of 311210121213 is 312121012113.

311210121213 is a `hidden beast` number, since 311 + 21 + 0 + 121 + 213 = 666.

It can be written as a sum of positive squares in only one way, i.e., 181294569369 + 129915551844 = 425787^2 + 360438^2 .

It is not a de Polignac number, because 311210121213 - 2¹³ = 311210113021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311210121263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17289451170 + ... + 17289451187.

It is an arithmetic number, because the mean of its divisors is an integer number (74920955109).

Almost surely, 2^311210121213 is an apocalyptic number.

It is an amenable number.

311210121213 is a deficient number, since it is larger than the sum of its proper divisors (138315609441).

311210121213 is a wasteful number, since it uses less digits than its factorization.

311210121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34578902363 (or 34578902360 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 311210121213 its reverse (312121012113), we get a palindrome (623331133326).

The spelling of 311210121213 in words is "three hundred eleven billion, two hundred ten million, one hundred twenty-one thousand, two hundred thirteen".