244191221 has 2 divisors, whose sum is σ = 244191222. Its totient is φ = 244191220.

The previous prime is 244191217. The next prime is 244191257. The reversal of 244191221 is 122191442.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123520996 + 120670225 = 11114^2 + 10985^2 .

It is a cyclic number.

It is not a de Polignac number, because 244191221 - 2² = 244191217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (244191271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122095610 + 122095611.

It is an arithmetic number, because the mean of its divisors is an integer number (122095611).

Almost surely, 2^244191221 is an apocalyptic number.

It is an amenable number.

244191221 is a deficient number, since it is larger than the sum of its proper divisors (1).

244191221 is an equidigital number, since it uses as much as digits as its factorization.

244191221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 244191221 is about 15626.6189881241. The cubic root of 244191221 is about 625.0431722711.

The spelling of 244191221 in words is "two hundred forty-four million, one hundred ninety-one thousand, two hundred twenty-one".