12521544 has 64 divisors (see below), whose sum is σ = 36301440. Its totient is φ = 3525120.

The previous prime is 12521543. The next prime is 12521569. The reversal of 12521544 is 44512521.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (12521543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11754 + ... + 12774.

It is an arithmetic number, because the mean of its divisors is an integer number (567210).

Almost surely, 2^12521544 is an apocalyptic number.

12521544 is a gapful number since it is divisible by the number (14) 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 12521544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18150720).

12521544 is an abundant number, since it is smaller than the sum of its proper divisors (23779896).

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

12521544 is a wasteful number, since it uses less digits than its factorization.

12521544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110 (or 1106 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 12521544 is about 3538.5793759643. The cubic root of 12521544 is about 232.2126963407.

12521544 divided by its sum of digits (24) gives a triangular number (521731 = T₁₀₂₁).

The spelling of 12521544 in words is "twelve million, five hundred twenty-one thousand, five hundred forty-four".