12121574400 has 1056 divisors, whose sum is σ = 51171724800. Its totient is φ = 2786918400.

The previous prime is 12121574393. The next prime is 12121574411. The reversal of 12121574400 is 447512121.

12121574400 is a `hidden beast` number, since 1 + 2 + 1 + 215 + 7 + 440 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 170726365 + ... + 170726435.

Almost surely, 2^12121574400 is an apocalyptic number.

12121574400 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 12121574400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25585862400).

12121574400 is an abundant number, since it is smaller than the sum of its proper divisors (39050150400).

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

12121574400 is a wasteful number, since it uses less digits than its factorization.

12121574400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The spelling of 12121574400 in words is "twelve billion, one hundred twenty-one million, five hundred seventy-four thousand, four hundred".