221795429 has 2 divisors, whose sum is σ = 221795430. Its totient is φ = 221795428.

The previous prime is 221795401. The next prime is 221795443. The reversal of 221795429 is 924597122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139476100 + 82319329 = 11810^2 + 9073^2 .

It is a cyclic number.

It is not a de Polignac number, because 221795429 - 2²⁴ = 205018213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221795459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110897714 + 110897715.

It is an arithmetic number, because the mean of its divisors is an integer number (110897715).

Almost surely, 2^221795429 is an apocalyptic number.

It is an amenable number.

221795429 is a deficient number, since it is larger than the sum of its proper divisors (1).

221795429 is an equidigital number, since it uses as much as digits as its factorization.

221795429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 221795429 is about 14892.7978902555. The cubic root of 221795429 is about 605.3188483909.

The spelling of 221795429 in words is "two hundred twenty-one million, seven hundred ninety-five thousand, four hundred twenty-nine".