221304020017 has 2 divisors, whose sum is σ = 221304020018. Its totient is φ = 221304020016.

The previous prime is 221304019997. The next prime is 221304020023. The reversal of 221304020017 is 710020403122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140331902881 + 80972117136 = 374609^2 + 284556^2 .

It is a cyclic number.

It is not a de Polignac number, because 221304020017 - 2¹⁵ = 221303987249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221304020017.

It is not a weakly prime, because it can be changed into another prime (221304024017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110652010008 + 110652010009.

It is an arithmetic number, because the mean of its divisors is an integer number (110652010009).

Almost surely, 2^221304020017 is an apocalyptic number.

It is an amenable number.

221304020017 is a deficient number, since it is larger than the sum of its proper divisors (1).

221304020017 is an equidigital number, since it uses as much as digits as its factorization.

221304020017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 221304020017 its reverse (710020403122), we get a palindrome (931324423139).

The spelling of 221304020017 in words is "two hundred twenty-one billion, three hundred four million, twenty thousand, seventeen".