221123120111 has 2 divisors, whose sum is σ = 221123120112. Its totient is φ = 221123120110.

The previous prime is 221123120039. The next prime is 221123120129. The reversal of 221123120111 is 111021321122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221123120111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221123120111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221123120131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561560055 + 110561560056.

It is an arithmetic number, because the mean of its divisors is an integer number (110561560056).

Almost surely, 2^221123120111 is an apocalyptic number.

221123120111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221123120111 is an equidigital number, since it uses as much as digits as its factorization.

221123120111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221123120111 its reverse (111021321122), we get a palindrome (332144441233).

The spelling of 221123120111 in words is "two hundred twenty-one billion, one hundred twenty-three million, one hundred twenty thousand, one hundred eleven".