121580987220 has 576 divisors, whose sum is σ = 467875699200. Its totient is φ = 24824217600.

The previous prime is 121580987219. The next prime is 121580987233. The reversal of 121580987220 is 22789085121.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 233360560 + ... + 233361080.

It is an arithmetic number, because the mean of its divisors is an integer number (812284200).

Almost surely, 2^121580987220 is an apocalyptic number.

121580987220 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 121580987220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233937849600).

121580987220 is an abundant number, since it is smaller than the sum of its proper divisors (346294711980).

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

121580987220 is a wasteful number, since it uses less digits than its factorization.

121580987220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 121580987220 in words is "one hundred twenty-one billion, five hundred eighty million, nine hundred eighty-seven thousand, two hundred twenty".