213311312331 has 16 divisors (see below), whose sum is σ = 306307387680. Its totient is φ = 131262405120.

The previous prime is 213311312329. The next prime is 213311312371. The reversal of 213311312331 is 133213113312.

It is not a de Polignac number, because 213311312331 - 2¹ = 213311312329 is a prime.

It is a super-2 number, since 2×213311312331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213311312371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811585 + ... + 1041773.

It is an arithmetic number, because the mean of its divisors is an integer number (19144211730).

Almost surely, 2^213311312331 is an apocalyptic number.

213311312331 is a deficient number, since it is larger than the sum of its proper divisors (92996075349).

213311312331 is a wasteful number, since it uses less digits than its factorization.

213311312331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253966.

The product of its digits is 972, while the sum is 24.

Adding to 213311312331 its reverse (133213113312), we get a palindrome (346524425643).

The spelling of 213311312331 in words is "two hundred thirteen billion, three hundred eleven million, three hundred twelve thousand, three hundred thirty-one".