121013539920 has 1200 divisors, whose sum is σ = 554598253440. Its totient is φ = 24173033472.

The previous prime is 121013539909. The next prime is 121013540041. The reversal of 121013539920 is 29935310121.

121013539920 is a `hidden beast` number, since 1 + 21 + 0 + 13 + 539 + 92 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 78426669 + ... + 78428211.

Almost surely, 2^121013539920 is an apocalyptic number.

121013539920 is a gapful number since it is divisible by the number (10) 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 121013539920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277299126720).

121013539920 is an abundant number, since it is smaller than the sum of its proper divisors (433584713520).

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

121013539920 is a wasteful number, since it uses less digits than its factorization.

121013539920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1614 (or 1592 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The spelling of 121013539920 in words is "one hundred twenty-one billion, thirteen million, five hundred thirty-nine thousand, nine hundred twenty".