221102071 has 2 divisors, whose sum is σ = 221102072. Its totient is φ = 221102070.

The previous prime is 221102039. The next prime is 221102081. The reversal of 221102071 is 170201122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221102071 - 2⁵ = 221102039 is a prime.

It is a super-3 number, since 3×221102071³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221102081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110551035 + 110551036.

It is an arithmetic number, because the mean of its divisors is an integer number (110551036).

Almost surely, 2^221102071 is an apocalyptic number.

221102071 is a deficient number, since it is larger than the sum of its proper divisors (1).

221102071 is an equidigital number, since it uses as much as digits as its factorization.

221102071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 221102071 is about 14869.5013702545. The cubic root of 221102071 is about 604.6874245373.

Adding to 221102071 its reverse (170201122), we get a palindrome (391303193).

The spelling of 221102071 in words is "two hundred twenty-one million, one hundred two thousand, seventy-one".