2002121 has 4 divisors (see below), whose sum is σ = 2184144. Its totient is φ = 1820100.

The previous prime is 2002093. The next prime is 2002151. The reversal of 2002121 is 1212002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2002121 - 2¹⁸ = 1739977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2002099 and 2002108.

It is not an unprimeable number, because it can be changed into a prime (2002151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90995 + ... + 91016.

It is an arithmetic number, because the mean of its divisors is an integer number (546036).

2^2002121 is an apocalyptic number.

It is an amenable number.

2002121 is a deficient number, since it is larger than the sum of its proper divisors (182023).

2002121 is a wasteful number, since it uses less digits than its factorization.

2002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182022.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 2002121 is about 1414.9632504062. The cubic root of 2002121 is about 126.0366274636.

Adding to 2002121 its reverse (1212002), we get a palindrome (3214123).

It can be divided in two parts, 2002 and 121, that multiplied together give a palindrome (242242).

The spelling of 2002121 in words is "two million, two thousand, one hundred twenty-one".