2001100023 has 24 divisors (see below), whose sum is σ = 3118232208. Its totient is φ = 1229306112.

The previous prime is 2001100019. The next prime is 2001100033. The reversal of 2001100023 is 3200011002.

It is a happy number.

It is not a de Polignac number, because 2001100023 - 2² = 2001100019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2001099978 and 2001100014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001100033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54111 + ... + 83247.

It is an arithmetic number, because the mean of its divisors is an integer number (129926342).

Almost surely, 2^2001100023 is an apocalyptic number.

2001100023 is a deficient number, since it is larger than the sum of its proper divisors (1117132185).

2001100023 is a wasteful number, since it uses less digits than its factorization.

2001100023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29743 (or 29740 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2001100023 is about 44733.6564903876. The cubic root of 2001100023 is about 1260.1519979142.

Adding to 2001100023 its reverse (3200011002), we get a palindrome (5201111025).

The spelling of 2001100023 in words is "two billion, one million, one hundred thousand, twenty-three".