202020021020021 has 16 divisors (see below), whose sum is σ = 205243666200576. Its totient is φ = 198821950800000.

The previous prime is 202020021020017. The next prime is 202020021020087. The reversal of 202020021020021 is 120020120020202.

It is a cyclic number.

It is not a de Polignac number, because 202020021020021 - 2² = 202020021020017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202020021019978 and 202020021020005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202020021020621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21519656 + ... + 29447166.

It is an arithmetic number, because the mean of its divisors is an integer number (12827729137536).

Almost surely, 2^{202020021020021} is an apocalyptic number.

It is an amenable number.

202020021020021 is a deficient number, since it is larger than the sum of its proper divisors (3223645180555).

202020021020021 is a wasteful number, since it uses less digits than its factorization.

202020021020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7929124.

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

Adding to 202020021020021 its reverse (120020120020202), we get a palindrome (322040141040223).

The spelling of 202020021020021 in words is "two hundred two trillion, twenty billion, twenty-one million, twenty thousand, twenty-one".