12521385195816 has 576 divisors, whose sum is σ = 41452636680000. Its totient is φ = 3130013601792.

The previous prime is 12521385195769. The next prime is 12521385195827. The reversal of 12521385195816 is 61859158312521.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 342761040 + ... + 342797568.

It is an arithmetic number, because the mean of its divisors is an integer number (71966383125).

Almost surely, 2^{12521385195816} 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 12521385195816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20726318340000).

12521385195816 is an abundant number, since it is smaller than the sum of its proper divisors (28931251484184).

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

12521385195816 is a wasteful number, since it uses less digits than its factorization.

12521385195816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36646 (or 36612 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 57.

The spelling of 12521385195816 in words is "twelve trillion, five hundred twenty-one billion, three hundred eighty-five million, one hundred ninety-five thousand, eight hundred sixteen".