12017221 has 2 divisors, whose sum is σ = 12017222. Its totient is φ = 12017220.

The previous prime is 12017209. The next prime is 12017227. The reversal of 12017221 is 12271021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6305121 + 5712100 = 2511^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 12017221 - 2⁵ = 12017189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12017195 and 12017204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12017227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6008610 + 6008611.

It is an arithmetic number, because the mean of its divisors is an integer number (6008611).

Almost surely, 2^12017221 is an apocalyptic number.

It is an amenable number.

12017221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12017221 is an equidigital number, since it uses as much as digits as its factorization.

12017221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 12017221 is about 3466.5863612493. The cubic root of 12017221 is about 229.0523135189.

Adding to 12017221 its reverse (12271021), we get a palindrome (24288242).

The spelling of 12017221 in words is "twelve million, seventeen thousand, two hundred twenty-one".