2001120023 has 4 divisors (see below), whose sum is σ = 2286994320. Its totient is φ = 1715245728.

The previous prime is 2001120013. The next prime is 2001120047. The reversal of 2001120023 is 3200211002.

It is a happy number.

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

It is not a de Polignac number, because 2001120023 - 2¹⁴ = 2001103639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001119986 and 2001120013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001120013) 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, 142937138 + ... + 142937151.

It is an arithmetic number, because the mean of its divisors is an integer number (571748580).

Almost surely, 2^2001120023 is an apocalyptic number.

2001120023 is a deficient number, since it is larger than the sum of its proper divisors (285874297).

2001120023 is an equidigital number, since it uses as much as digits as its factorization.

2001120023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285874296.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2001120023 is about 44733.8800351590. The cubic root of 2001120023 is about 1260.1561960978.

Adding to 2001120023 its reverse (3200211002), we get a palindrome (5201331025).

The spelling of 2001120023 in words is "two billion, one million, one hundred twenty thousand, twenty-three".