221242201 has 2 divisors, whose sum is σ = 221242202. Its totient is φ = 221242200.

The previous prime is 221242171. The next prime is 221242211. The reversal of 221242201 is 102242122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123232201 + 98010000 = 11101^2 + 9900^2 .

It is a cyclic number.

It is not a de Polignac number, because 221242201 - 2⁵ = 221242169 is a prime.

It is a super-2 number, since 2×221242201² = 97896223006648802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221242211) 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, 110621100 + 110621101.

It is an arithmetic number, because the mean of its divisors is an integer number (110621101).

Almost surely, 2^221242201 is an apocalyptic number.

It is an amenable number.

221242201 is a deficient number, since it is larger than the sum of its proper divisors (1).

221242201 is an equidigital number, since it uses as much as digits as its factorization.

221242201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221242201 is about 14874.2126178161. The cubic root of 221242201 is about 604.8151437602.

Adding to 221242201 its reverse (102242122), we get a palindrome (323484323).

The spelling of 221242201 in words is "two hundred twenty-one million, two hundred forty-two thousand, two hundred one".