231312221310 has 64 divisors (see below), whose sum is σ = 563356145664. Its totient is φ = 60772588800.

The previous prime is 231312221293. The next prime is 231312221317. The reversal of 231312221310 is 13122213132.

It is a super-2 number, since 2×231312221310² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312221317) 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, 3117867 + ... + 3191193.

It is an arithmetic number, because the mean of its divisors is an integer number (8802439776).

Almost surely, 2^231312221310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231312221310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281678072832).

231312221310 is an abundant number, since it is smaller than the sum of its proper divisors (332043924354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231312221310 is a wasteful number, since it uses less digits than its factorization.

231312221310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74889.

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

Adding to 231312221310 its reverse (13122213132), we get a palindrome (244434434442).

The spelling of 231312221310 in words is "two hundred thirty-one billion, three hundred twelve million, two hundred twenty-one thousand, three hundred ten".