123011213112 has 96 divisors (see below), whose sum is σ = 345599982000. Its totient is φ = 40991215104.

The previous prime is 123011213089. The next prime is 123011213153. The reversal of 123011213112 is 211312110321.

123011213112 is a `hidden beast` number, since 1 + 230 + 1 + 121 + 311 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8112514 + ... + 8127662.

Almost surely, 2^123011213112 is an apocalyptic number.

123011213112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123011213112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172799991000).

123011213112 is an abundant number, since it is smaller than the sum of its proper divisors (222588768888).

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

123011213112 is a wasteful number, since it uses less digits than its factorization.

123011213112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19347 (or 19331 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 123011213112 its reverse (211312110321), we get a palindrome (334323323433).

The spelling of 123011213112 in words is "one hundred twenty-three billion, eleven million, two hundred thirteen thousand, one hundred twelve".