121399559424 has 1296 divisors, whose sum is σ = 457168071360. Its totient is φ = 30656102400.

The previous prime is 121399559423. The next prime is 121399559447. The reversal of 121399559424 is 424955993121.

121399559424 is a `hidden beast` number, since 1 + 21 + 3 + 9 + 9 + 5 + 594 + 24 = 666.

Its product of digits (3499200) is a multiple of the sum of its prime factors (160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121399559423) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2823245547 + ... + 2823245589.

Almost surely, 2^121399559424 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 121399559424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228584035680).

121399559424 is an abundant number, since it is smaller than the sum of its proper divisors (335768511936).

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

121399559424 is a wasteful number, since it uses less digits than its factorization.

121399559424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 132 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The spelling of 121399559424 in words is "one hundred twenty-one billion, three hundred ninety-nine million, five hundred fifty-nine thousand, four hundred twenty-four".