31221332123311 has 16 divisors (see below), whose sum is σ = 34146269521920. Its totient is φ = 28310837338080.

The previous prime is 31221332123309. The next prime is 31221332123323. The reversal of 31221332123311 is 11332123312213.

It is not a de Polignac number, because 31221332123311 - 2¹ = 31221332123309 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 31221332123311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221332123341) 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 15 ways as a sum of consecutive naturals, for example, 276143130 + ... + 276256168.

It is an arithmetic number, because the mean of its divisors is an integer number (2134141845120).

Almost surely, 2^{31221332123311} is an apocalyptic number.

31221332123311 is a deficient number, since it is larger than the sum of its proper divisors (2924937398609).

31221332123311 is a wasteful number, since it uses less digits than its factorization.

31221332123311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176694.

The product of its digits is 3888, while the sum is 28.

Adding to 31221332123311 its reverse (11332123312213), we get a palindrome (42553455435524).

The spelling of 31221332123311 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred thirty-two million, one hundred twenty-three thousand, three hundred eleven".