2001323123244 has 72 divisors (see below), whose sum is σ = 5069307716928. Its totient is φ = 665736234240.

The previous prime is 2001323123243. The next prime is 2001323123311. The reversal of 2001323123244 is 4423213231002.

2001323123244 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 323 + 12 + 324 + 4 = 666.

It is a super-2 number, since 2×2001323123244² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2001323123243) 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, 54334354 + ... + 54371174.

It is an arithmetic number, because the mean of its divisors is an integer number (70407051624).

Almost surely, 2^{2001323123244} is an apocalyptic number.

It is an amenable number.

2001323123244 is an abundant number, since it is smaller than the sum of its proper divisors (3067984593684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001323123244 is a wasteful number, since it uses less digits than its factorization.

2001323123244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39895 (or 39890 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 2001323123244 its reverse (4423213231002), we get a palindrome (6424536354246).

The spelling of 2001323123244 in words is "two trillion, one billion, three hundred twenty-three million, one hundred twenty-three thousand, two hundred forty-four".