2311223221031 has 4 divisors (see below), whose sum is σ = 2311226387592. Its totient is φ = 2311220054472.

The previous prime is 2311223220997. The next prime is 2311223221039. The reversal of 2311223221031 is 1301223221132.

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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2311223221031 is a prime.

It is a super-2 number, since 2×2311223221031² (a number of 26 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 = 2311223220988 and 2311223221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311223221039) 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, 128321 + ... + 2153813.

It is an arithmetic number, because the mean of its divisors is an integer number (577806596898).

Almost surely, 2^{2311223221031} is an apocalyptic number.

2311223221031 is a deficient number, since it is larger than the sum of its proper divisors (3166561).

2311223221031 is a wasteful number, since it uses less digits than its factorization.

2311223221031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166560.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 2311223221031 its reverse (1301223221132), we get a palindrome (3612446442163).

The spelling of 2311223221031 in words is "two trillion, three hundred eleven billion, two hundred twenty-three million, two hundred twenty-one thousand, thirty-one".