2002122121 has 4 divisors (see below), whose sum is σ = 2044720512. Its totient is φ = 1959523732.

The previous prime is 2002122049. The next prime is 2002122139. The reversal of 2002122121 is 1212212002.

It is a happy number.

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 2002122121 - 2⁹ = 2002121609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2002122151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21299125 + ... + 21299218.

It is an arithmetic number, because the mean of its divisors is an integer number (511180128).

Almost surely, 2^2002122121 is an apocalyptic number.

It is an amenable number.

2002122121 is a deficient number, since it is larger than the sum of its proper divisors (42598391).

2002122121 is an equidigital number, since it uses as much as digits as its factorization.

2002122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42598390.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2002122121 is about 44745.0792937056. The cubic root of 2002122121 is about 1260.3665098651.

Adding to 2002122121 its reverse (1212212002), we get a palindrome (3214334123).

The spelling of 2002122121 in words is "two billion, two million, one hundred twenty-two thousand, one hundred twenty-one".