121111216123 has 2 divisors, whose sum is σ = 121111216124. Its totient is φ = 121111216122.

The previous prime is 121111216103. The next prime is 121111216147. The reversal of 121111216123 is 321612111121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121111216123 - 2⁹ = 121111215611 is a prime.

It is a super-2 number, since 2×121111216123² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121111216094 and 121111216103.

It is not a weakly prime, because it can be changed into another prime (121111216103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555608061 + 60555608062.

It is an arithmetic number, because the mean of its divisors is an integer number (60555608062).

Almost surely, 2^121111216123 is an apocalyptic number.

121111216123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111216123 is an equidigital number, since it uses as much as digits as its factorization.

121111216123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 22.

Adding to 121111216123 its reverse (321612111121), we get a palindrome (442723327244).

The spelling of 121111216123 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred sixteen thousand, one hundred twenty-three".