12372221 has 2 divisors, whose sum is σ = 12372222. Its totient is φ = 12372220.

The previous prime is 12372169. The next prime is 12372223. The reversal of 12372221 is 12227321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12348196 + 24025 = 3514^2 + 155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12372221 is a prime.

Together with 12372223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12372193 and 12372202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12372223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6186110 + 6186111.

It is an arithmetic number, because the mean of its divisors is an integer number (6186111).

Almost surely, 2^12372221 is an apocalyptic number.

It is an amenable number.

12372221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12372221 is an equidigital number, since it uses as much as digits as its factorization.

12372221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 20.

The square root of 12372221 is about 3517.4168078293. The cubic root of 12372221 is about 231.2859349075.

Adding to 12372221 its reverse (12227321), we get a palindrome (24599542).

The spelling of 12372221 in words is "twelve million, three hundred seventy-two thousand, two hundred twenty-one".