31213221223 has 8 divisors (see below), whose sum is σ = 32857747200. Its totient is φ = 29568867768.

The previous prime is 31213221203. The next prime is 31213221287. The reversal of 31213221223 is 32212231213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31213221223 - 2¹⁷ = 31213090151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31213221194 and 31213221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213221203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510738 + ... + 568576.

It is an arithmetic number, because the mean of its divisors is an integer number (4107218400).

Almost surely, 2^31213221223 is an apocalyptic number.

31213221223 is a deficient number, since it is larger than the sum of its proper divisors (1644525977).

31213221223 is a wasteful number, since it uses less digits than its factorization.

31213221223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86261.

The product of its digits is 864, while the sum is 22.

Adding to 31213221223 its reverse (32212231213), we get a palindrome (63425452436).

The spelling of 31213221223 in words is "thirty-one billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred twenty-three".