2002221202021 has 4 divisors (see below), whose sum is σ = 2002224032044. Its totient is φ = 2002218372000.

The previous prime is 2002221202001. The next prime is 2002221202031. The reversal of 2002221202021 is 1202021222002.

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 718237605121 + 1283983596900 = 847489^2 + 1133130^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002221202021 - 2²¹ = 2002219104869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2002221201986 and 2002221202004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002221202001) 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, 698641 + ... + 2119561.

It is an arithmetic number, because the mean of its divisors is an integer number (500556008011).

Almost surely, 2^{2002221202021} is an apocalyptic number.

It is an amenable number.

2002221202021 is a deficient number, since it is larger than the sum of its proper divisors (2830023).

2002221202021 is a wasteful number, since it uses less digits than its factorization.

2002221202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830022.

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

Adding to 2002221202021 its reverse (1202021222002), we get a palindrome (3204242424023).

The spelling of 2002221202021 in words is "two trillion, two billion, two hundred twenty-one million, two hundred two thousand, twenty-one".