221050591 has 2 divisors, whose sum is σ = 221050592. Its totient is φ = 221050590.

The previous prime is 221050549. The next prime is 221050597. The reversal of 221050591 is 195050122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221050591 - 2¹¹ = 221048543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221050597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110525295 + 110525296.

It is an arithmetic number, because the mean of its divisors is an integer number (110525296).

Almost surely, 2^221050591 is an apocalyptic number.

221050591 is a deficient number, since it is larger than the sum of its proper divisors (1).

221050591 is an equidigital number, since it uses as much as digits as its factorization.

221050591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 221050591 is about 14867.7702094161. The cubic root of 221050591 is about 604.6404903698.

The spelling of 221050591 in words is "two hundred twenty-one million, fifty thousand, five hundred ninety-one".