221413261 has 2 divisors, whose sum is σ = 221413262. Its totient is φ = 221413260.

The previous prime is 221413237. The next prime is 221413271. The reversal of 221413261 is 162314122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210424036 + 10989225 = 14506^2 + 3315^2 .

It is a cyclic number.

It is not a de Polignac number, because 221413261 - 2⁹ = 221412749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221413211) 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, 110706630 + 110706631.

It is an arithmetic number, because the mean of its divisors is an integer number (110706631).

Almost surely, 2^221413261 is an apocalyptic number.

It is an amenable number.

221413261 is a deficient number, since it is larger than the sum of its proper divisors (1).

221413261 is an equidigital number, since it uses as much as digits as its factorization.

221413261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 221413261 is about 14879.9617271013. The cubic root of 221413261 is about 604.9709805538.

Adding to 221413261 its reverse (162314122), we get a palindrome (383727383).

The spelling of 221413261 in words is "two hundred twenty-one million, four hundred thirteen thousand, two hundred sixty-one".