221323112123 has 2 divisors, whose sum is σ = 221323112124. Its totient is φ = 221323112122.

The previous prime is 221323112113. The next prime is 221323112177. The reversal of 221323112123 is 321211323122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221323112123 - 2¹⁰ = 221323111099 is a prime.

It is not a weakly prime, because it can be changed into another prime (221323112113) 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, 110661556061 + 110661556062.

It is an arithmetic number, because the mean of its divisors is an integer number (110661556062).

Almost surely, 2^221323112123 is an apocalyptic number.

221323112123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221323112123 is an equidigital number, since it uses as much as digits as its factorization.

221323112123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 221323112123 its reverse (321211323122), we get a palindrome (542534435245).

The spelling of 221323112123 in words is "two hundred twenty-one billion, three hundred twenty-three million, one hundred twelve thousand, one hundred twenty-three".