1231220112 has 20 divisors (see below), whose sum is σ = 3180652080. Its totient is φ = 410406688.

The previous prime is 1231220069. The next prime is 1231220113. The reversal of 1231220112 is 2110221321.

It is a junction number, because it is equal to n+sod(n) for n = 1231220091 and 1231220100.

It is not an unprimeable number, because it can be changed into a prime (1231220113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12825162 + ... + 12825257.

It is an arithmetic number, because the mean of its divisors is an integer number (159032604).

Almost surely, 2^1231220112 is an apocalyptic number.

1231220112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1231220112 is an abundant number, since it is smaller than the sum of its proper divisors (1949431968).

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

1231220112 is a wasteful number, since it uses less digits than its factorization.

1231220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25650430 (or 25650424 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1231220112 is about 35088.7462300949. The cubic root of 1231220112 is about 1071.7954285884.

Adding to 1231220112 its reverse (2110221321), we get a palindrome (3341441433).

The spelling of 1231220112 in words is "one billion, two hundred thirty-one million, two hundred twenty thousand, one hundred twelve".