12369221 has 2 divisors, whose sum is σ = 12369222. Its totient is φ = 12369220.

The previous prime is 12369199. The next prime is 12369223. The reversal of 12369221 is 12296321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12348196 + 21025 = 3514^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 12369221 - 2⁶ = 12369157 is a prime.

Together with 12369223, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₈₁₀₇₃₇ and since 12369221 and 810737 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12369223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6184610 + 6184611.

It is an arithmetic number, because the mean of its divisors is an integer number (6184611).

Almost surely, 2^12369221 is an apocalyptic number.

It is an amenable number.

12369221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12369221 is an equidigital number, since it uses as much as digits as its factorization.

12369221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 12369221 is about 3516.9903326566. The cubic root of 12369221 is about 231.2672394258.

Subtracting from 12369221 its reverse (12296321), we obtain a square (72900 = 270²).

The spelling of 12369221 in words is "twelve million, three hundred sixty-nine thousand, two hundred twenty-one".