20002221002021 has 4 divisors (see below), whose sum is σ = 21178822237452. Its totient is φ = 18825619766592.

The previous prime is 20002221001993. The next prime is 20002221002033. The reversal of 20002221002021 is 12020012220002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16914416445796 + 3087804556225 = 4112714^2 + 1757215^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002221002021 - 2²² = 20002216807717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002221001987 and 20002221002005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002221002521) 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, 588300617690 + ... + 588300617723.

It is an arithmetic number, because the mean of its divisors is an integer number (5294705559363).

Almost surely, 2^{20002221002021} is an apocalyptic number.

It is an amenable number.

20002221002021 is a deficient number, since it is larger than the sum of its proper divisors (1176601235431).

20002221002021 is a wasteful number, since it uses less digits than its factorization.

20002221002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176601235430.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20002221002021 its reverse (12020012220002), we get a palindrome (32022233222023).

The spelling of 20002221002021 in words is "twenty trillion, two billion, two hundred twenty-one million, two thousand, twenty-one".