31213102223 has 16 divisors (see below), whose sum is σ = 32934021120. Its totient is φ = 29523031296.

The previous prime is 31213102213. The next prime is 31213102237. The reversal of 31213102223 is 32220131213.

It is a cyclic number.

It is not a de Polignac number, because 31213102223 - 2³⁰ = 30139360399 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31213102195 and 31213102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213102213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2937386 + ... + 2947992.

It is an arithmetic number, because the mean of its divisors is an integer number (2058376320).

Almost surely, 2^31213102223 is an apocalyptic number.

31213102223 is a deficient number, since it is larger than the sum of its proper divisors (1720918897).

31213102223 is a wasteful number, since it uses less digits than its factorization.

31213102223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12046.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31213102223 its reverse (32220131213), we get a palindrome (63433233436).

The spelling of 31213102223 in words is "thirty-one billion, two hundred thirteen million, one hundred two thousand, two hundred twenty-three".