121569979440 has 1280 divisors, whose sum is σ = 515551002624. Its totient is φ = 22992076800.

The previous prime is 121569979397. The next prime is 121569979451. The reversal of 121569979440 is 44979965121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 576160935 + ... + 576161145.

Almost surely, 2^121569979440 is an apocalyptic number.

121569979440 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 121569979440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257775501312).

121569979440 is an abundant number, since it is smaller than the sum of its proper divisors (393981023184).

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

121569979440 is a wasteful number, since it uses less digits than its factorization.

121569979440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 57.

The spelling of 121569979440 in words is "one hundred twenty-one billion, five hundred sixty-nine million, nine hundred seventy-nine thousand, four hundred forty".