12270221 has 2 divisors, whose sum is σ = 12270222. Its totient is φ = 12270220.

The previous prime is 12270217. The next prime is 12270229. The reversal of 12270221 is 12207221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9066121 + 3204100 = 3011^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 12270221 - 2² = 12270217 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12270221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12270229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6135110 + 6135111.

It is an arithmetic number, because the mean of its divisors is an integer number (6135111).

Almost surely, 2^12270221 is an apocalyptic number.

It is an amenable number.

12270221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12270221 is an equidigital number, since it uses as much as digits as its factorization.

12270221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 12270221 is about 3502.8875231728. The cubic root of 12270221 is about 230.6485851913.

Adding to 12270221 its reverse (12207221), we get a palindrome (24477442).

The spelling of 12270221 in words is "twelve million, two hundred seventy thousand, two hundred twenty-one".