221121163 has 2 divisors, whose sum is σ = 221121164. Its totient is φ = 221121162.

The previous prime is 221121137. The next prime is 221121167. The reversal of 221121163 is 361121122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221121163 - 2¹³ = 221112971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221121163.

It is not a weakly prime, because it can be changed into another prime (221121167) 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, 110560581 + 110560582.

It is an arithmetic number, because the mean of its divisors is an integer number (110560582).

Almost surely, 2^221121163 is an apocalyptic number.

221121163 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121163 is an equidigital number, since it uses as much as digits as its factorization.

221121163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 221121163 is about 14870.1433416091. The cubic root of 221121163 is about 604.7048288067.

Adding to 221121163 its reverse (361121122), we get a palindrome (582242285).

The spelling of 221121163 in words is "two hundred twenty-one million, one hundred twenty-one thousand, one hundred sixty-three".