20031011111123 has 4 divisors (see below), whose sum is σ = 20572389789840. Its totient is φ = 19489632432408.

The previous prime is 20031011111101. The next prime is 20031011111141. The reversal of 20031011111123 is 32111111013002.

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

It is a cyclic number.

It is not a de Polignac number, because 20031011111123 - 2²² = 20031006916819 is a prime.

It is a super-2 number, since 2×20031011111123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20031011119123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270689339303 + ... + 270689339376.

It is an arithmetic number, because the mean of its divisors is an integer number (5143097447460).

Almost surely, 2^{20031011111123} is an apocalyptic number.

20031011111123 is a deficient number, since it is larger than the sum of its proper divisors (541378678717).

20031011111123 is an equidigital number, since it uses as much as digits as its factorization.

20031011111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541378678716.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 20031011111123 its reverse (32111111013002), we get a palindrome (52142122124125).

The spelling of 20031011111123 in words is "twenty trillion, thirty-one billion, eleven million, one hundred eleven thousand, one hundred twenty-three".