121899712 has 56 divisors (see below), whose sum is σ = 265176000. Its totient is φ = 55138560.

The previous prime is 121899709. The next prime is 121899727. The reversal of 121899712 is 217998121.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244039 + ... + 244537.

Almost surely, 2^121899712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121899712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132588000).

121899712 is an abundant number, since it is smaller than the sum of its proper divisors (143276288).

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

121899712 is a wasteful number, since it uses less digits than its factorization.

121899712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 859 counting only the distinct ones).

The product of its digits is 18144, while the sum is 40.

The square root of 121899712 is about 11040.8202593829. The cubic root of 121899712 is about 495.8316285954.

The spelling of 121899712 in words is "one hundred twenty-one million, eight hundred ninety-nine thousand, seven hundred twelve".