31113223031321 has 4 divisors (see below), whose sum is σ = 31113234245172. Its totient is φ = 31113211817472.

The previous prime is 31113223031269. The next prime is 31113223031383. The reversal of 31113223031321 is 12313032231113.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10966456126096 + 20146766905225 = 3311564^2 + 4488515^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113223031321 - 2⁴² = 26715176520217 is a prime.

It is a super-2 number, since 2×31113223031321² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31113223034321) 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, 1949141 + ... + 8125613.

It is an arithmetic number, because the mean of its divisors is an integer number (7778308561293).

Almost surely, 2^{31113223031321} is an apocalyptic number.

It is an amenable number.

31113223031321 is a deficient number, since it is larger than the sum of its proper divisors (11213851).

31113223031321 is an equidigital number, since it uses as much as digits as its factorization.

31113223031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11213850.

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

Adding to 31113223031321 its reverse (12313032231113), we get a palindrome (43426255262434).

The spelling of 31113223031321 in words is "thirty-one trillion, one hundred thirteen billion, two hundred twenty-three million, thirty-one thousand, three hundred twenty-one".