221221111020163 has 2 divisors, whose sum is σ = 221221111020164. Its totient is φ = 221221111020162.

The previous prime is 221221111020079. The next prime is 221221111020197. The reversal of 221221111020163 is 361020111122122.

221221111020163 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221221111020163 - 2¹⁷ = 221221110889091 is a prime.

It is not a weakly prime, because it can be changed into another prime (221221111020563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610555510081 + 110610555510082.

It is an arithmetic number, because the mean of its divisors is an integer number (110610555510082).

Almost surely, 2^{221221111020163} is an apocalyptic number.

221221111020163 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221111020163 is an equidigital number, since it uses as much as digits as its factorization.

221221111020163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 221221111020163 its reverse (361020111122122), we get a palindrome (582241222142285).

The spelling of 221221111020163 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, twenty thousand, one hundred sixty-three".