104221391 has 2 divisors, whose sum is σ = 104221392. Its totient is φ = 104221390.

The previous prime is 104221343. The next prime is 104221399. The reversal of 104221391 is 193122401.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 104221391 - 2²⁶ = 37112527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104221399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52110695 + 52110696.

It is an arithmetic number, because the mean of its divisors is an integer number (52110696).

Almost surely, 2^104221391 is an apocalyptic number.

104221391 is a deficient number, since it is larger than the sum of its proper divisors (1).

104221391 is an equidigital number, since it uses as much as digits as its factorization.

104221391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 104221391 is about 10208.8878434431. The cubic root of 104221391 is about 470.6003961266.

Adding to 104221391 its reverse (193122401), we get a palindrome (297343792).

The spelling of 104221391 in words is "one hundred four million, two hundred twenty-one thousand, three hundred ninety-one".