12755221 has 4 divisors (see below), whose sum is σ = 12934944. Its totient is φ = 12575500.

The previous prime is 12755207. The next prime is 12755227. The reversal of 12755221 is 12255721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12255721 = 1511 ⋅8111.

It is a cyclic number.

It is not a de Polignac number, because 12755221 - 2¹³ = 12747029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12755227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89755 + ... + 89896.

It is an arithmetic number, because the mean of its divisors is an integer number (3233736).

Almost surely, 2^12755221 is an apocalyptic number.

It is an amenable number.

12755221 is a deficient number, since it is larger than the sum of its proper divisors (179723).

12755221 is an equidigital number, since it uses as much as digits as its factorization.

12755221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179722.

The product of its digits is 1400, while the sum is 25.

The square root of 12755221 is about 3571.4452256755. The cubic root of 12755221 is about 233.6483199463.

Subtracting from 12755221 its reverse (12255721), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 12755221 in words is "twelve million, seven hundred fifty-five thousand, two hundred twenty-one".