31122020111223 has 4 divisors (see below), whose sum is σ = 41496026814968. Its totient is φ = 20748013407480.

The previous prime is 31122020111213. The next prime is 31122020111321. The reversal of 31122020111223 is 32211102022113.

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

It is not a de Polignac number, because 31122020111223 - 2⁶ = 31122020111159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31122020111223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122020111213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5187003351868 + ... + 5187003351873.

It is an arithmetic number, because the mean of its divisors is an integer number (10374006703742).

Almost surely, 2^{31122020111223} is an apocalyptic number.

31122020111223 is a deficient number, since it is larger than the sum of its proper divisors (10374006703745).

31122020111223 is a wasteful number, since it uses less digits than its factorization.

31122020111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10374006703744.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 31122020111223 its reverse (32211102022113), we get a palindrome (63333122133336).

The spelling of 31122020111223 in words is "thirty-one trillion, one hundred twenty-two billion, twenty million, one hundred eleven thousand, two hundred twenty-three".