12521755 has 4 divisors (see below), whose sum is σ = 15026112. Its totient is φ = 10017400.

The previous prime is 12521753. The next prime is 12521767. The reversal of 12521755 is 55712521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55712521 = 4721 ⋅11801.

It is not a de Polignac number, because 12521755 - 2¹ = 12521753 is a prime.

It is a super-3 number, since 3×12521755³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521753) 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 3 ways as a sum of consecutive naturals, for example, 1252171 + ... + 1252180.

It is an arithmetic number, because the mean of its divisors is an integer number (3756528).

Almost surely, 2^12521755 is an apocalyptic number.

12521755 is a deficient number, since it is larger than the sum of its proper divisors (2504357).

12521755 is an equidigital number, since it uses as much as digits as its factorization.

12521755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504356.

The product of its digits is 3500, while the sum is 28.

The square root of 12521755 is about 3538.6091900632. The cubic root of 12521755 is about 232.2140006687.

The spelling of 12521755 in words is "twelve million, five hundred twenty-one thousand, seven hundred fifty-five".