12521138 has 16 divisors (see below), whose sum is σ = 21514560. Its totient is φ = 5353776.

The previous prime is 12521137. The next prime is 12521141. The reversal of 12521138 is 83112521.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12521137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7853 + ... + 9311.

It is an arithmetic number, because the mean of its divisors is an integer number (1344660).

Almost surely, 2^12521138 is an apocalyptic number.

12521138 is a deficient number, since it is larger than the sum of its proper divisors (8993422).

12521138 is a wasteful number, since it uses less digits than its factorization.

12521138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081.

The product of its digits is 480, while the sum is 23.

The square root of 12521138 is about 3538.5220078445. The cubic root of 12521138 is about 232.2101865497.

Adding to 12521138 its reverse (83112521), we get a palindrome (95633659).

The spelling of 12521138 in words is "twelve million, five hundred twenty-one thousand, one hundred thirty-eight".