123131112120212 has 18 divisors (see below), whose sum is σ = 250659763959402. Its totient is φ = 52770476622864.

The previous prime is 123131112120199. The next prime is 123131112120239. The reversal of 123131112120212 is 212021211131321.

It can be written as a sum of positive squares in only one way, i.e., 82796241371536 + 40334870748676 = 9099244^2 + 6350974^2 .

It is a super-2 number, since 2×123131112120212² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 314109979703 + ... + 314109980094.

It is an arithmetic number, because the mean of its divisors is an integer number (13925542442189).

Almost surely, 2^{123131112120212} is an apocalyptic number.

It is an amenable number.

123131112120212 is an abundant number, since it is smaller than the sum of its proper divisors (127528651839190).

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

123131112120212 is a wasteful number, since it uses less digits than its factorization.

123131112120212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628219959815 (or 628219959806 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 123131112120212 its reverse (212021211131321), we get a palindrome (335152323251533).

The spelling of 123131112120212 in words is "one hundred twenty-three trillion, one hundred thirty-one billion, one hundred twelve million, one hundred twenty thousand, two hundred twelve".