202020202022021 has 16 divisors (see below), whose sum is σ = 214266587258160. Its totient is φ = 189814179287040.

The previous prime is 202020202021999. The next prime is 202020202022033. The reversal of 202020202022021 is 120220202020202.

202020202022021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 33916297012900 + 168103905009121 = 5823770^2 + 12965489^2 .

It is a cyclic number.

It is not a de Polignac number, because 202020202022021 - 2³⁰ = 202019128280197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202020202022071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139633625 + ... + 141072993.

It is an arithmetic number, because the mean of its divisors is an integer number (13391661703635).

Almost surely, 2^{202020202022021} is an apocalyptic number.

It is an amenable number.

202020202022021 is a deficient number, since it is larger than the sum of its proper divisors (12246385236139).

202020202022021 is a wasteful number, since it uses less digits than its factorization.

202020202022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453384.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 202020202022021 its reverse (120220202020202), we get a palindrome (322240404042223).

The spelling of 202020202022021 in words is "two hundred two trillion, twenty billion, two hundred two million, twenty-two thousand, twenty-one".