221042413 has 2 divisors, whose sum is σ = 221042414. Its totient is φ = 221042412.

The previous prime is 221042389. The next prime is 221042441. The reversal of 221042413 is 314240122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140707044 + 80335369 = 11862^2 + 8963^2 .

It is a cyclic number.

It is not a de Polignac number, because 221042413 - 2²⁵ = 187487981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221042113) 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, 110521206 + 110521207.

It is an arithmetic number, because the mean of its divisors is an integer number (110521207).

Almost surely, 2^221042413 is an apocalyptic number.

It is an amenable number.

221042413 is a deficient number, since it is larger than the sum of its proper divisors (1).

221042413 is an equidigital number, since it uses as much as digits as its factorization.

221042413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221042413 is about 14867.4951824441. The cubic root of 221042413 is about 604.6330338401.

Adding to 221042413 its reverse (314240122), we get a palindrome (535282535).

The spelling of 221042413 in words is "two hundred twenty-one million, forty-two thousand, four hundred thirteen".