31233213122 has 4 divisors (see below), whose sum is σ = 46849819686. Its totient is φ = 15616606560.

The previous prime is 31233213119. The next prime is 31233213149. The reversal of 31233213122 is 22131233213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22131233213 = 23 ⋅962227531.

It can be written as a sum of positive squares in only one way, i.e., 23926211761 + 7307001361 = 154681^2 + 85481^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7808303279 + ... + 7808303282.

Almost surely, 2^31233213122 is an apocalyptic number.

31233213122 is a deficient number, since it is larger than the sum of its proper divisors (15616606564).

31233213122 is a wasteful number, since it uses less digits than its factorization.

31233213122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15616606563.

The product of its digits is 1296, while the sum is 23.

Adding to 31233213122 its reverse (22131233213), we get a palindrome (53364446335).

The spelling of 31233213122 in words is "thirty-one billion, two hundred thirty-three million, two hundred thirteen thousand, one hundred twenty-two".