2001121 has 8 divisors (see below), whose sum is σ = 2159784. Its totient is φ = 1847040.

The previous prime is 2001101. The next prime is 2001127. The reversal of 2001121 is 1211002.

2001121 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 4 ways, for example, as 921600 + 1079521 = 960^2 + 1039^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2001121 - 2¹⁵ = 1968353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001127) 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, 210 + ... + 2011.

It is an arithmetic number, because the mean of its divisors is an integer number (269973).

2^2001121 is an apocalyptic number.

It is an amenable number.

2001121 is a deficient number, since it is larger than the sum of its proper divisors (158663).

2001121 is a wasteful number, since it uses less digits than its factorization.

2001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 2001121 is about 1414.6098402033. The cubic root of 2001121 is about 126.0156401178.

Adding to 2001121 its reverse (1211002), we get a palindrome (3212123).

The spelling of 2001121 in words is "two million, one thousand, one hundred twenty-one".