12521436480 has 252 divisors, whose sum is σ = 50100684660. Its totient is φ = 2862010368.

The previous prime is 12521436419. The next prime is 12521436481. The reversal of 12521436480 is 8463412521.

It is a happy number.

12521436480 is a `hidden beast` number, since 1 + 2 + 5 + 2 + 1 + 4 + 3 + 648 + 0 = 666.

12521436480 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3092249664 + 9429186816 = 55608^2 + 97104^2 .

It is a tau number, because it is divible by the number of its divisors (252).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521436481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 96756 + ... + 185484.

Almost surely, 2^12521436480 is an apocalyptic number.

12521436480 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 12521436480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25050342330).

12521436480 is an abundant number, since it is smaller than the sum of its proper divisors (37579248180).

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

12521436480 is a wasteful number, since it uses less digits than its factorization.

12521436480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88766 (or 88746 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 12521436480 in words is "twelve billion, five hundred twenty-one million, four hundred thirty-six thousand, four hundred eighty".