121998226560 has 512 divisors, whose sum is σ = 465231237120. Its totient is φ = 26587545600.

The previous prime is 121998226523. The next prime is 121998226591. The reversal of 121998226560 is 65622899121.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 174034210 + ... + 174034910.

It is an arithmetic number, because the mean of its divisors is an integer number (908654760).

Almost surely, 2^121998226560 is an apocalyptic number.

121998226560 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 121998226560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232615618560).

121998226560 is an abundant number, since it is smaller than the sum of its proper divisors (343233010560).

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

121998226560 is a wasteful number, since it uses less digits than its factorization.

121998226560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 1304 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 121998226560 in words is "one hundred twenty-one billion, nine hundred ninety-eight million, two hundred twenty-six thousand, five hundred sixty".