221022111221111 has 2 divisors, whose sum is σ = 221022111221112. Its totient is φ = 221022111221110.

The previous prime is 221022111221081. The next prime is 221022111221123. The reversal of 221022111221111 is 111122111220122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221022111221111 - 2²² = 221022107026807 is a prime.

It is a super-2 number, since 2×221022111221111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221022111221911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110511055610555 + 110511055610556.

It is an arithmetic number, because the mean of its divisors is an integer number (110511055610556).

Almost surely, 2^{221022111221111} is an apocalyptic number.

221022111221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221022111221111 is an equidigital number, since it uses as much as digits as its factorization.

221022111221111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 221022111221111 its reverse (111122111220122), we get a palindrome (332144222441233).

The spelling of 221022111221111 in words is "two hundred twenty-one trillion, twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, one hundred eleven".