31023121103231 has 4 divisors (see below), whose sum is σ = 31024051951200. Its totient is φ = 31022190255264.

The previous prime is 31023121103201. The next prime is 31023121103263. The reversal of 31023121103231 is 13230112132013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31023121103231 is a prime.

It is a super-2 number, since 2×31023121103231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31023121103197 and 31023121103206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023121103201) 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, 465373991 + ... + 465440648.

It is an arithmetic number, because the mean of its divisors is an integer number (7756012987800).

Almost surely, 2^{31023121103231} is an apocalyptic number.

31023121103231 is a deficient number, since it is larger than the sum of its proper divisors (930847969).

31023121103231 is an equidigital number, since it uses as much as digits as its factorization.

31023121103231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930847968.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31023121103231 its reverse (13230112132013), we get a palindrome (44253233235244).

The spelling of 31023121103231 in words is "thirty-one trillion, twenty-three billion, one hundred twenty-one million, one hundred three thousand, two hundred thirty-one".