2002131121 has 4 divisors (see below), whose sum is σ = 2003871744. Its totient is φ = 2000390500.

The previous prime is 2002131083. The next prime is 2002131143. The reversal of 2002131121 is 1211312002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1211312002 = 2 ⋅605656001.

It is a cyclic number.

It is not a de Polignac number, because 2002131121 - 2⁷ = 2002130993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2002131151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868585 + ... + 870886.

It is an arithmetic number, because the mean of its divisors is an integer number (500967936).

Almost surely, 2^2002131121 is an apocalyptic number.

It is an amenable number.

2002131121 is a deficient number, since it is larger than the sum of its proper divisors (1740623).

2002131121 is a wasteful number, since it uses less digits than its factorization.

2002131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740622.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2002131121 is about 44745.1798633104. The cubic root of 2002131121 is about 1260.3683984081.

Adding to 2002131121 its reverse (1211312002), we get a palindrome (3213443123).

The spelling of 2002131121 in words is "two billion, two million, one hundred thirty-one thousand, one hundred twenty-one".