221111120123 has 2 divisors, whose sum is σ = 221111120124. Its totient is φ = 221111120122.

The previous prime is 221111120081. The next prime is 221111120129. The reversal of 221111120123 is 321021111122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221111120123 - 2¹⁴ = 221111103739 is a prime.

It is not a weakly prime, because it can be changed into another prime (221111120129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555560061 + 110555560062.

It is an arithmetic number, because the mean of its divisors is an integer number (110555560062).

Almost surely, 2^221111120123 is an apocalyptic number.

221111120123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111120123 is an equidigital number, since it uses as much as digits as its factorization.

221111120123 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 221111120123 its reverse (321021111122), we get a palindrome (542132231245).

Subtracting 221111120123 from its reverse (321021111122), we obtain a palindrome (99909990999).

The spelling of 221111120123 in words is "two hundred twenty-one billion, one hundred eleven million, one hundred twenty thousand, one hundred twenty-three".