31321213122 has 32 divisors (see below), whose sum is σ = 63631366272. Its totient is φ = 10276170624.

The previous prime is 31321213109. The next prime is 31321213129. The reversal of 31321213122 is 22131212313.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31321213129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139888 + ... + 286724.

It is an arithmetic number, because the mean of its divisors is an integer number (1988480196).

Almost surely, 2^31321213122 is an apocalyptic number.

31321213122 is an abundant number, since it is smaller than the sum of its proper divisors (32310153150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31321213122 is a wasteful number, since it uses less digits than its factorization.

31321213122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147402.

The product of its digits is 432, while the sum is 21.

Adding to 31321213122 its reverse (22131212313), we get a palindrome (53452425435).

The spelling of 31321213122 in words is "thirty-one billion, three hundred twenty-one million, two hundred thirteen thousand, one hundred twenty-two".