12769221 has 4 divisors (see below), whose sum is σ = 17025632. Its totient is φ = 8512812.

The previous prime is 12769217. The next prime is 12769259. The reversal of 12769221 is 12296721.

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 not a de Polignac number, because 12769221 - 2² = 12769217 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 (12769291) 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, 2128201 + ... + 2128206.

It is an arithmetic number, because the mean of its divisors is an integer number (4256408).

Almost surely, 2^12769221 is an apocalyptic number.

It is an amenable number.

12769221 is a deficient number, since it is larger than the sum of its proper divisors (4256411).

12769221 is an equidigital number, since it uses as much as digits as its factorization.

12769221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256410.

The product of its digits is 3024, while the sum is 30.

The square root of 12769221 is about 3573.4046790141. The cubic root of 12769221 is about 233.7337720249.

The spelling of 12769221 in words is "twelve million, seven hundred sixty-nine thousand, two hundred twenty-one".