31231321031321 has 4 divisors (see below), whose sum is σ = 31232078617872. Its totient is φ = 31230563444772.

The previous prime is 31231321031249. The next prime is 31231321031327. The reversal of 31231321031321 is 12313012313213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31231321031321 - 2³⁴ = 31214141162137 is a prime.

It is a super-2 number, since 2×31231321031321² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31231321031327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378731435 + ... + 378813888.

It is an arithmetic number, because the mean of its divisors is an integer number (7808019654468).

Almost surely, 2^{31231321031321} is an apocalyptic number.

It is an amenable number.

31231321031321 is a deficient number, since it is larger than the sum of its proper divisors (757586551).

31231321031321 is an equidigital number, since it uses as much as digits as its factorization.

31231321031321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757586550.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 31231321031321 its reverse (12313012313213), we get a palindrome (43544333344534).

The spelling of 31231321031321 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty-one million, thirty-one thousand, three hundred twenty-one".