12521987894400 has 768 divisors, whose sum is σ = 44775452937600. Its totient is φ = 3063545856000.

The previous prime is 12521987894393. The next prime is 12521987894459. The reversal of 12521987894400 is 449878912521.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 4217576116 + ... + 4217579084.

Almost surely, 2^{12521987894400} is an apocalyptic number.

12521987894400 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 12521987894400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22387726468800).

12521987894400 is an abundant number, since it is smaller than the sum of its proper divisors (32253465043200).

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

12521987894400 is a wasteful number, since it uses less digits than its factorization.

12521987894400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657 (or 3640 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 60.

The spelling of 12521987894400 in words is "twelve trillion, five hundred twenty-one billion, nine hundred eighty-seven million, eight hundred ninety-four thousand, four hundred".