2002021222021 has 4 divisors (see below), whose sum is σ = 2002024189132. Its totient is φ = 2002018254912.

The previous prime is 2002021221931. The next prime is 2002021222027. The reversal of 2002021222021 is 1202221202002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1032611630625 + 969409591396 = 1016175^2 + 984586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002021222021 - 2²¹ = 2002019124869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2002021221986 and 2002021222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002021222027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72781 + ... + 2002333.

It is an arithmetic number, because the mean of its divisors is an integer number (500506047283).

Almost surely, 2^{2002021222021} is an apocalyptic number.

It is an amenable number.

2002021222021 is a deficient number, since it is larger than the sum of its proper divisors (2967111).

2002021222021 is a wasteful number, since it uses less digits than its factorization.

2002021222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967110.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 2002021222021 its reverse (1202221202002), we get a palindrome (3204242424023).

The spelling of 2002021222021 in words is "two trillion, two billion, twenty-one million, two hundred twenty-two thousand, twenty-one".