31213222111999 has 4 divisors (see below), whose sum is σ = 31231658748136. Its totient is φ = 31194785475864.

The previous prime is 31213222111943. The next prime is 31213222112089. The reversal of 31213222111999 is 99911122231213.

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

It is a cyclic number.

It is not a de Polignac number, because 31213222111999 - 2⁴³ = 22417129089791 is a prime.

It is a super-2 number, since 2×31213222111999² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213222111199) 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, 9218315529 + ... + 9218318914.

It is an arithmetic number, because the mean of its divisors is an integer number (7807914687034).

Almost surely, 2^{31213222111999} is an apocalyptic number.

31213222111999 is a deficient number, since it is larger than the sum of its proper divisors (18436636137).

31213222111999 is a wasteful number, since it uses less digits than its factorization.

31213222111999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18436636136.

The product of its digits is 104976, while the sum is 46.

The spelling of 31213222111999 in words is "thirty-one trillion, two hundred thirteen billion, two hundred twenty-two million, one hundred eleven thousand, nine hundred ninety-nine".