20010111123 has 4 divisors (see below), whose sum is σ = 26680148168. Its totient is φ = 13340074080.

The previous prime is 20010111091. The next prime is 20010111139. The reversal of 20010111123 is 32111101002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20010111123 - 2⁵ = 20010111091 is a prime.

It is a super-2 number, since 2×20010111123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010111099 and 20010111108.

It is not an unprimeable number, because it can be changed into a prime (20010111923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335018518 + ... + 3335018523.

It is an arithmetic number, because the mean of its divisors is an integer number (6670037042).

Almost surely, 2^20010111123 is an apocalyptic number.

20010111123 is a deficient number, since it is larger than the sum of its proper divisors (6670037045).

20010111123 is an equidigital number, since it uses as much as digits as its factorization.

20010111123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670037044.

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

Adding to 20010111123 its reverse (32111101002), we get a palindrome (52121212125).

The spelling of 20010111123 in words is "twenty billion, ten million, one hundred eleven thousand, one hundred twenty-three".