31212312122 has 4 divisors (see below), whose sum is σ = 46818468186. Its totient is φ = 15606156060.

The previous prime is 31212312121. The next prime is 31212312139. The reversal of 31212312122 is 22121321213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31197803641 + 14508481 = 176629^2 + 3809^2 .

It is a super-2 number, since 2×31212312122² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31212312094 and 31212312103.

It is not an unprimeable number, because it can be changed into a prime (31212312121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7803078029 + ... + 7803078032.

Almost surely, 2^31212312122 is an apocalyptic number.

31212312122 is a deficient number, since it is larger than the sum of its proper divisors (15606156064).

31212312122 is a wasteful number, since it uses less digits than its factorization.

31212312122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606156063.

The product of its digits is 288, while the sum is 20.

Adding to 31212312122 its reverse (22121321213), we get a palindrome (53333633335).

Subtracting from 31212312122 its reverse (22121321213), we obtain a palindrome (9090990909).

The spelling of 31212312122 in words is "thirty-one billion, two hundred twelve million, three hundred twelve thousand, one hundred twenty-two".