221122202011111 has 2 divisors, whose sum is σ = 221122202011112. Its totient is φ = 221122202011110.

The previous prime is 221122202011099. The next prime is 221122202011121. The reversal of 221122202011111 is 111110202221122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221122202011111 - 2¹⁵ = 221122201978343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221122202011121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561101005555 + 110561101005556.

It is an arithmetic number, because the mean of its divisors is an integer number (110561101005556).

Almost surely, 2^{221122202011111} is an apocalyptic number.

221122202011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221122202011111 is an equidigital number, since it uses as much as digits as its factorization.

221122202011111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221122202011111 its reverse (111110202221122), we get a palindrome (332232404232233).

The spelling of 221122202011111 in words is "two hundred twenty-one trillion, one hundred twenty-two billion, two hundred two million, eleven thousand, one hundred eleven".