231321310311 has 32 divisors (see below), whose sum is σ = 379631795200. Its totient is φ = 122006767104.

The previous prime is 231321310277. The next prime is 231321310327. The reversal of 231321310311 is 113013123132.

It is a happy number.

It is not a de Polignac number, because 231321310311 - 2¹¹ = 231321308263 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321310331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5642415 + ... + 5683263.

It is an arithmetic number, because the mean of its divisors is an integer number (11863493600).

Almost surely, 2^231321310311 is an apocalyptic number.

231321310311 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231321310311 is a deficient number, since it is larger than the sum of its proper divisors (148310484889).

231321310311 is a wasteful number, since it uses less digits than its factorization.

231321310311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61615.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 231321310311 its reverse (113013123132), we get a palindrome (344334433443).

The spelling of 231321310311 in words is "two hundred thirty-one billion, three hundred twenty-one million, three hundred ten thousand, three hundred eleven".