1231320012 has 24 divisors (see below), whose sum is σ = 3094086576. Its totient is φ = 378867648.

The previous prime is 1231320011. The next prime is 1231320017. The reversal of 1231320012 is 2100231321.

It is a super-2 number, since 2×1231320012² = 3032297943903360288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231319973 and 1231320000.

It is not an unprimeable number, because it can be changed into a prime (1231320011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3946383 + ... + 3946694.

It is an arithmetic number, because the mean of its divisors is an integer number (128920274).

Almost surely, 2^1231320012 is an apocalyptic number.

1231320012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231320012 is an abundant number, since it is smaller than the sum of its proper divisors (1862766564).

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

1231320012 is a wasteful number, since it uses less digits than its factorization.

1231320012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7893097 (or 7893095 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1231320012 is about 35090.1697345567. The cubic root of 1231320012 is about 1071.8244159499.

Adding to 1231320012 its reverse (2100231321), we get a palindrome (3331551333).

The spelling of 1231320012 in words is "one billion, two hundred thirty-one million, three hundred twenty thousand, twelve".