2001432123 has 6 divisors (see below), whose sum is σ = 2890957524. Its totient is φ = 1334288076.

The previous prime is 2001432113. The next prime is 2001432131. The reversal of 2001432123 is 3212341002.

It is not a de Polignac number, because 2001432123 - 2⁵ = 2001432091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001432096 and 2001432105.

It is not an unprimeable number, because it can be changed into a prime (2001432113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111190665 + ... + 111190682.

It is an arithmetic number, because the mean of its divisors is an integer number (481826254).

Almost surely, 2^2001432123 is an apocalyptic number.

2001432123 is a deficient number, since it is larger than the sum of its proper divisors (889525401).

2001432123 is a wasteful number, since it uses less digits than its factorization.

2001432123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222381353 (or 222381350 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2001432123 is about 44737.3683065958. The cubic root of 2001432123 is about 1260.2217051294.

Adding to 2001432123 its reverse (3212341002), we get a palindrome (5213773125).

The spelling of 2001432123 in words is "two billion, one million, four hundred thirty-two thousand, one hundred twenty-three".