123001211111 has 4 divisors (see below), whose sum is σ = 123002011272. Its totient is φ = 123000410952.

The previous prime is 123001211027. The next prime is 123001211119. The reversal of 123001211111 is 111112100321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123001211111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123001211119) 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 in 3 ways as a sum of consecutive naturals, for example, 88736 + ... + 503861.

It is an arithmetic number, because the mean of its divisors is an integer number (30750502818).

Almost surely, 2^123001211111 is an apocalyptic number.

123001211111 is a deficient number, since it is larger than the sum of its proper divisors (800161).

123001211111 is an equidigital number, since it uses as much as digits as its factorization.

123001211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800160.

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

Adding to 123001211111 its reverse (111112100321), we get a palindrome (234113311432).

The spelling of 123001211111 in words is "one hundred twenty-three billion, one million, two hundred eleven thousand, one hundred eleven".