2001167121 has 16 divisors (see below), whose sum is σ = 2852613504. Its totient is φ = 1243440384.

The previous prime is 2001167117. The next prime is 2001167143. The reversal of 2001167121 is 1217611002.

It is a happy number.

It is not a de Polignac number, because 2001167121 - 2² = 2001167117 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2001167111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185226 + ... + 195731.

It is an arithmetic number, because the mean of its divisors is an integer number (178288344).

Almost surely, 2^2001167121 is an apocalyptic number.

It is an amenable number.

2001167121 is a deficient number, since it is larger than the sum of its proper divisors (851446383).

2001167121 is a wasteful number, since it uses less digits than its factorization.

2001167121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381080.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 2001167121 is about 44734.4064563284. The cubic root of 2001167121 is about 1260.1660822899.

Adding to 2001167121 its reverse (1217611002), we get a palindrome (3218778123).

The spelling of 2001167121 in words is "two billion, one million, one hundred sixty-seven thousand, one hundred twenty-one".