112121221905 has 96 divisors (see below), whose sum is σ = 252833218560. Its totient is φ = 44569895040.

The previous prime is 112121221889. The next prime is 112121221931. The reversal of 112121221905 is 509122121211.

It is not a de Polignac number, because 112121221905 - 2⁴ = 112121221889 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 623745 + ... + 783134.

It is an arithmetic number, because the mean of its divisors is an integer number (2633679360).

Almost surely, 2^112121221905 is an apocalyptic number.

112121221905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

112121221905 is an abundant number, since it is smaller than the sum of its proper divisors (140711996655).

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

112121221905 is a wasteful number, since it uses less digits than its factorization.

112121221905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406931 (or 1406928 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The spelling of 112121221905 in words is "one hundred twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred five".