12255221 has 4 divisors (see below), whose sum is σ = 13369344. Its totient is φ = 11141100.

The previous prime is 12255179. The next prime is 12255227.

It is a happy number.

12255221 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is not a de Polignac number, because 12255221 - 2¹⁰ = 12254197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12255193 and 12255202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12255227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557045 + ... + 557066.

It is an arithmetic number, because the mean of its divisors is an integer number (3342336).

Almost surely, 2^12255221 is an apocalyptic number.

12255221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12255221 is a deficient number, since it is larger than the sum of its proper divisors (1114123).

12255221 is a wasteful number, since it uses less digits than its factorization.

12255221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114122.

The product of its digits is 400, while the sum is 20.

The square root of 12255221 is about 3500.7457776879. The cubic root of 12255221 is about 230.5545597308.

It can be divided in two parts, 1225 and 5221, that added together give a palindrome (6446).

The spelling of 12255221 in words is "twelve million, two hundred fifty-five thousand, two hundred twenty-one".