2001143121 has 8 divisors (see below), whose sum is σ = 2670443424. Its totient is φ = 1332969120.

The previous prime is 2001143071. The next prime is 2001143189. The reversal of 2001143121 is 1213411002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001143121 - 2⁷ = 2001142993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001143121.

It is not an unprimeable number, because it can be changed into a prime (2001143021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277420 + ... + 284541.

It is an arithmetic number, because the mean of its divisors is an integer number (333805428).

Almost surely, 2^2001143121 is an apocalyptic number.

It is an amenable number.

2001143121 is a deficient number, since it is larger than the sum of its proper divisors (669300303).

2001143121 is a wasteful number, since it uses less digits than its factorization.

2001143121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563151.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2001143121 is about 44734.1382056255. The cubic root of 2001143121 is about 1260.1610445453.

Adding to 2001143121 its reverse (1213411002), we get a palindrome (3214554123).

The spelling of 2001143121 in words is "two billion, one million, one hundred forty-three thousand, one hundred twenty-one".