12521799 has 24 divisors (see below), whose sum is σ = 19190912. Its totient is φ = 7853760.

The previous prime is 12521797. The next prime is 12521801. The reversal of 12521799 is 99712521.

It is an interprime number because it is at equal distance from previous prime (12521797) and next prime (12521801).

It is not a de Polignac number, because 12521799 - 2¹ = 12521797 is a prime.

It is a super-3 number, since 3×12521799³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12521797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9717 + ... + 10929.

Almost surely, 2^12521799 is an apocalyptic number.

12521799 is a deficient number, since it is larger than the sum of its proper divisors (6669113).

12521799 is a wasteful number, since it uses less digits than its factorization.

12521799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287 (or 1284 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 12521799 is about 3538.6154071897. The cubic root of 12521799 is about 232.2142726595.

It can be divided in two parts, 125217 and 99, that added together give a square (125316 = 354²).

The spelling of 12521799 in words is "twelve million, five hundred twenty-one thousand, seven hundred ninety-nine".