221338091473 has 2 divisors, whose sum is σ = 221338091474. Its totient is φ = 221338091472.

The previous prime is 221338091453. The next prime is 221338091531. The reversal of 221338091473 is 374190833122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110817083664 + 110521007809 = 332892^2 + 332447^2 .

It is a cyclic number.

It is not a de Polignac number, because 221338091473 - 2⁵ = 221338091441 is a prime.

It is not a weakly prime, because it can be changed into another prime (221338091453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110669045736 + 110669045737.

It is an arithmetic number, because the mean of its divisors is an integer number (110669045737).

Almost surely, 2^221338091473 is an apocalyptic number.

It is an amenable number.

221338091473 is a deficient number, since it is larger than the sum of its proper divisors (1).

221338091473 is an equidigital number, since it uses as much as digits as its factorization.

221338091473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 221338091473 in words is "two hundred twenty-one billion, three hundred thirty-eight million, ninety-one thousand, four hundred seventy-three".