1312120231212 has 48 divisors (see below), whose sum is σ = 3499429133312. Its totient is φ = 374844153600.

The previous prime is 1312120231063. The next prime is 1312120231223. The reversal of 1312120231212 is 2121320212131.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314413 + ... + 1650180.

Almost surely, 2^{1312120231212} is an apocalyptic number.

1312120231212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1312120231212 is an abundant number, since it is smaller than the sum of its proper divisors (2187308902100).

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

1312120231212 is a wasteful number, since it uses less digits than its factorization.

1312120231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972558 (or 1972556 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1312120231212 its reverse (2121320212131), we get a palindrome (3433440443343).

The spelling of 1312120231212 in words is "one trillion, three hundred twelve billion, one hundred twenty million, two hundred thirty-one thousand, two hundred twelve".