221221022111 has 2 divisors, whose sum is σ = 221221022112. Its totient is φ = 221221022110.

The previous prime is 221221022089. The next prime is 221221022131. The reversal of 221221022111 is 111220122122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221221022111 - 2²² = 221216827807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221221022111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221022131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610511055 + 110610511056.

It is an arithmetic number, because the mean of its divisors is an integer number (110610511056).

Almost surely, 2^221221022111 is an apocalyptic number.

221221022111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221221022111 is an equidigital number, since it uses as much as digits as its factorization.

221221022111 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 17.

Adding to 221221022111 its reverse (111220122122), we get a palindrome (332441144233).

The spelling of 221221022111 in words is "two hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, one hundred eleven".