1321131312 has 60 divisors (see below), whose sum is σ = 3783334984. Its totient is φ = 430133760.

The previous prime is 1321131283. The next prime is 1321131359. The reversal of 1321131312 is 2131311231.

1321131312 is a `hidden beast` number, since 1 + 321 + 1 + 31 + 312 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100489 + ... + 112872.

Almost surely, 2^1321131312 is an apocalyptic number.

1321131312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321131312 is an abundant number, since it is smaller than the sum of its proper divisors (2462203672).

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

1321131312 is a wasteful number, since it uses less digits than its factorization.

1321131312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213418 (or 213409 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1321131312 is about 36347.3700836801. The cubic root of 1321131312 is about 1097.2746062255.

Adding to 1321131312 its reverse (2131311231), we get a palindrome (3452442543).

The spelling of 1321131312 in words is "one billion, three hundred twenty-one million, one hundred thirty-one thousand, three hundred twelve".