221112121123 has 2 divisors, whose sum is σ = 221112121124. Its totient is φ = 221112121122.

The previous prime is 221112121099. The next prime is 221112121127. The reversal of 221112121123 is 321121211122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221112121123 - 2⁹ = 221112120611 is a prime.

It is a super-2 number, since 2×221112121123² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221112121123.

It is not a weakly prime, because it can be changed into another prime (221112121127) 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, 110556060561 + 110556060562.

It is an arithmetic number, because the mean of its divisors is an integer number (110556060562).

Almost surely, 2^221112121123 is an apocalyptic number.

221112121123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221112121123 is an equidigital number, since it uses as much as digits as its factorization.

221112121123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 19.

Adding to 221112121123 its reverse (321121211122), we get a palindrome (542233332245).

The spelling of 221112121123 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, one hundred twenty-three".