121999580912 has 160 divisors (see below), whose sum is σ = 285024614400. Its totient is φ = 49937817600.

The previous prime is 121999580903. The next prime is 121999580939. The reversal of 121999580912 is 219085999121.

It is a super-3 number, since 3×121999580912³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8247539 + ... + 8262317.

It is an arithmetic number, because the mean of its divisors is an integer number (1781403840).

Almost surely, 2^121999580912 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 121999580912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142512307200).

121999580912 is an abundant number, since it is smaller than the sum of its proper divisors (163025033488).

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

121999580912 is a wasteful number, since it uses less digits than its factorization.

121999580912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14935 (or 14929 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 56.

The spelling of 121999580912 in words is "one hundred twenty-one billion, nine hundred ninety-nine million, five hundred eighty thousand, nine hundred twelve".