123111100121 has 16 divisors (see below), whose sum is σ = 133054444800. Its totient is φ = 113560147008.

The previous prime is 123111100051. The next prime is 123111100129. The reversal of 123111100121 is 121001111321.

It is a de Polignac number, because none of the positive numbers 2^k-123111100121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123111100096 and 123111100105.

It is not an unprimeable number, because it can be changed into a prime (123111100129) 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 in 15 ways as a sum of consecutive naturals, for example, 441620 + ... + 664266.

It is an arithmetic number, because the mean of its divisors is an integer number (8315902800).

Almost surely, 2^123111100121 is an apocalyptic number.

It is an amenable number.

123111100121 is a deficient number, since it is larger than the sum of its proper divisors (9943344679).

123111100121 is a wasteful number, since it uses less digits than its factorization.

123111100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223528.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 123111100121 its reverse (121001111321), we get a palindrome (244112211442).

The spelling of 123111100121 in words is "one hundred twenty-three billion, one hundred eleven million, one hundred thousand, one hundred twenty-one".