12146221 has 2 divisors, whose sum is σ = 12146222. Its totient is φ = 12146220.

The previous prime is 12146201. The next prime is 12146287. The reversal of 12146221 is 12264121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9696996 + 2449225 = 3114^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 12146221 - 2¹³ = 12138029 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12146201) 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 as a sum of consecutive naturals, namely, 6073110 + 6073111.

It is an arithmetic number, because the mean of its divisors is an integer number (6073111).

Almost surely, 2^12146221 is an apocalyptic number.

It is an amenable number.

12146221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12146221 is an equidigital number, since it uses as much as digits as its factorization.

12146221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 19.

The square root of 12146221 is about 3485.1428952053. The cubic root of 12146221 is about 229.8689928158.

The spelling of 12146221 in words is "twelve million, one hundred forty-six thousand, two hundred twenty-one".