2002122121121 has 4 divisors (see below), whose sum is σ = 2002148324544. Its totient is φ = 2002095917700.

The previous prime is 2002122121093. The next prime is 2002122121159. The reversal of 2002122121121 is 1211212212002.

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 a de Polignac number, because none of the positive numbers 2^k-2002122121121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2002122121121.

It is not an unprimeable number, because it can be changed into a prime (2002122121421) 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, 12986765 + ... + 13140026.

It is an arithmetic number, because the mean of its divisors is an integer number (500537081136).

Almost surely, 2^{2002122121121} is an apocalyptic number.

It is an amenable number.

2002122121121 is a deficient number, since it is larger than the sum of its proper divisors (26203423).

2002122121121 is an equidigital number, since it uses as much as digits as its factorization.

2002122121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26203422.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2002122121121 its reverse (1211212212002), we get a palindrome (3213334333123).

The spelling of 2002122121121 in words is "two trillion, two billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred twenty-one".