111212321123 has 2 divisors, whose sum is σ = 111212321124. Its totient is φ = 111212321122.

The previous prime is 111212321113. The next prime is 111212321147. The reversal of 111212321123 is 321123212111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111212321123 - 2⁸ = 111212320867 is a prime.

It is a super-2 number, since 2×111212321123² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 111212321095 and 111212321104.

It is not a weakly prime, because it can be changed into another prime (111212321113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55606160561 + 55606160562.

It is an arithmetic number, because the mean of its divisors is an integer number (55606160562).

Almost surely, 2^111212321123 is an apocalyptic number.

111212321123 is a deficient number, since it is larger than the sum of its proper divisors (1).

111212321123 is an equidigital number, since it uses as much as digits as its factorization.

111212321123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 20.

Adding to 111212321123 its reverse (321123212111), we get a palindrome (432335533234).

The spelling of 111212321123 in words is "one hundred eleven billion, two hundred twelve million, three hundred twenty-one thousand, one hundred twenty-three".