221211163 has 2 divisors, whose sum is σ = 221211164. Its totient is φ = 221211162.

The previous prime is 221211149. The next prime is 221211203. The reversal of 221211163 is 361112122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221211163 - 2²¹ = 219114011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221211163.

It is not a weakly prime, because it can be changed into another prime (221217163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605581 + 110605582.

It is an arithmetic number, because the mean of its divisors is an integer number (110605582).

Almost surely, 2^221211163 is an apocalyptic number.

221211163 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211163 is an equidigital number, since it uses as much as digits as its factorization.

221211163 is an evil number, because the sum of its binary digits is even.

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

The square root of 221211163 is about 14873.1692318752. The cubic root of 221211163 is about 604.7868593276.

Adding to 221211163 its reverse (361112122), we get a palindrome (582323285).

The spelling of 221211163 in words is "two hundred twenty-one million, two hundred eleven thousand, one hundred sixty-three".