12521400 has 96 divisors (see below), whose sum is σ = 39841200. Its totient is φ = 3251200.

The previous prime is 12521381. The next prime is 12521447. The reversal of 12521400 is 412521.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12521400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24346 + ... + 24854.

Almost surely, 2^12521400 is an apocalyptic number.

12521400 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 12521400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19920600).

12521400 is an abundant number, since it is smaller than the sum of its proper divisors (27319800).

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

12521400 is a wasteful number, since it uses less digits than its factorization.

12521400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 12521400 is about 3538.5590287573. The cubic root of 12521400 is about 232.2118061747.

Adding to 12521400 its reverse (412521), we get a palindrome (12933921).

It can be divided in two parts, 12521 and 400, that added together give a palindrome (12921).

The spelling of 12521400 in words is "twelve million, five hundred twenty-one thousand, four hundred".