2001123100023 has 4 divisors (see below), whose sum is σ = 2668164133368. Its totient is φ = 1334082066680.

The previous prime is 2001123100021. The next prime is 2001123100043. The reversal of 2001123100023 is 3200013211002.

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 2001123100023 - 2¹ = 2001123100021 is a prime.

It is a super-2 number, since 2×2001123100023² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2001123099975 and 2001123100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001123100021) 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, 333520516668 + ... + 333520516673.

It is an arithmetic number, because the mean of its divisors is an integer number (667041033342).

Almost surely, 2^{2001123100023} is an apocalyptic number.

2001123100023 is a deficient number, since it is larger than the sum of its proper divisors (667041033345).

2001123100023 is an equidigital number, since it uses as much as digits as its factorization.

2001123100023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667041033344.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 2001123100023 its reverse (3200013211002), we get a palindrome (5201136311025).

The spelling of 2001123100023 in words is "two trillion, one billion, one hundred twenty-three million, one hundred thousand, twenty-three".