221323441 has 2 divisors, whose sum is σ = 221323442. Its totient is φ = 221323440.

The previous prime is 221323409. The next prime is 221323463. The reversal of 221323441 is 144323122.

It is an a-pointer prime, because the next prime (221323463) can be obtained adding 221323441 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220968225 + 355216 = 14865^2 + 596^2 .

It is a cyclic number.

It is not a de Polignac number, because 221323441 - 2⁵ = 221323409 is a prime.

It is not a weakly prime, because it can be changed into another prime (221323741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110661720 + 110661721.

It is an arithmetic number, because the mean of its divisors is an integer number (110661721).

Almost surely, 2^221323441 is an apocalyptic number.

It is an amenable number.

221323441 is a deficient number, since it is larger than the sum of its proper divisors (1).

221323441 is an equidigital number, since it uses as much as digits as its factorization.

221323441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

The square root of 221323441 is about 14876.9432680238. The cubic root of 221323441 is about 604.8891639503.

Adding to 221323441 its reverse (144323122), we get a palindrome (365646563).

The spelling of 221323441 in words is "two hundred twenty-one million, three hundred twenty-three thousand, four hundred forty-one".