123131031212 has 144 divisors (see below), whose sum is σ = 279748092960. Its totient is φ = 47046924288.

The previous prime is 123131031209. The next prime is 123131031259. The reversal of 123131031212 is 212130131321.

It is a happy number.

It is a super-2 number, since 2×123131031212² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5109263 + ... + 5133305.

It is an arithmetic number, because the mean of its divisors is an integer number (1942695090).

Almost surely, 2^123131031212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123131031212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139874046480).

123131031212 is an abundant number, since it is smaller than the sum of its proper divisors (156617061748).

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

123131031212 is a wasteful number, since it uses less digits than its factorization.

123131031212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24160 (or 24151 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 123131031212 its reverse (212130131321), we get a palindrome (335261162533).

The spelling of 123131031212 in words is "one hundred twenty-three billion, one hundred thirty-one million, thirty-one thousand, two hundred twelve".