2100001111123 has 16 divisors (see below), whose sum is σ = 2123185502592. Its totient is φ = 2076929712000.

The previous prime is 2100001111099. The next prime is 2100001111211. The reversal of 2100001111123 is 3211111000012.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100001111123 is a prime.

It is a super-2 number, since 2×2100001111123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2100001111723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151366315 + ... + 151380187.

It is an arithmetic number, because the mean of its divisors is an integer number (132699093912).

Almost surely, 2^{2100001111123} is an apocalyptic number.

2100001111123 is a deficient number, since it is larger than the sum of its proper divisors (23184391469).

2100001111123 is a wasteful number, since it uses less digits than its factorization.

2100001111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17826.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 2100001111123 its reverse (3211111000012), we get a palindrome (5311112111135).

The spelling of 2100001111123 in words is "two trillion, one hundred billion, one million, one hundred eleven thousand, one hundred twenty-three".