121389722454528 has 2560 divisors, whose sum is σ = 429485425459200. Its totient is φ = 33502475059200.

The previous prime is 121389722454521. The next prime is 121389722454541. The reversal of 121389722454528 is 825454227983121.

It is a happy number.

121389722454528 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 89 + 7 + 2 + 2 + 4 + 545 + 2 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (121389722454521) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 1074245331400 + ... + 1074245331512.

It is an arithmetic number, because the mean of its divisors is an integer number (167767744320).

Almost surely, 2^{121389722454528} is an apocalyptic number.

121389722454528 is a gapful number since it is divisible by the number (18) 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 121389722454528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214742712729600).

121389722454528 is an abundant number, since it is smaller than the sum of its proper divisors (308095703004672).

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

121389722454528 is a wasteful number, since it uses less digits than its factorization.

121389722454528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 349 counting only the distinct ones).

The product of its digits is 77414400, while the sum is 63.

The spelling of 121389722454528 in words is "one hundred twenty-one trillion, three hundred eighty-nine billion, seven hundred twenty-two million, four hundred fifty-four thousand, five hundred twenty-eight".