2001200123 has 12 divisors (see below), whose sum is σ = 2252922000. Its totient is φ = 1766939856.

The previous prime is 2001200083. The next prime is 2001200141. The reversal of 2001200123 is 3210021002.

It is a happy number.

It is not a de Polignac number, because 2001200123 - 2¹² = 2001196027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001200143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138623 + ... + 152376.

It is an arithmetic number, because the mean of its divisors is an integer number (187743500).

Almost surely, 2^2001200123 is an apocalyptic number.

2001200123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2001200123 is a deficient number, since it is larger than the sum of its proper divisors (251721877).

2001200123 is a wasteful number, since it uses less digits than its factorization.

2001200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291058 (or 291035 counting only the distinct ones).

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

The square root of 2001200123 is about 44734.7753207725. The cubic root of 2001200123 is about 1260.1730095429.

Adding to 2001200123 its reverse (3210021002), we get a palindrome (5211221125).

The spelling of 2001200123 in words is "two billion, one million, two hundred thousand, one hundred twenty-three".