31221222212213 has 48 divisors (see below), whose sum is σ = 34858532089920. Its totient is φ = 27938832768000.

The previous prime is 31221222212203. The next prime is 31221222212221.

31221222212213 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31221222212213 - 2⁴ = 31221222212197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221222212203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4980252443 + ... + 4980258711.

It is an arithmetic number, because the mean of its divisors is an integer number (726219418540).

Almost surely, 2^{31221222212213} is an apocalyptic number.

It is an amenable number.

31221222212213 is a deficient number, since it is larger than the sum of its proper divisors (3637309877707).

31221222212213 is a wasteful number, since it uses less digits than its factorization.

31221222212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8610 (or 8599 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

It can be divided in two parts, 3122122 and 2212213, that added together give a palindrome (5334335).

The spelling of 31221222212213 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred thirteen".