20020021112021 has 6 divisors (see below), whose sum is σ = 23288595987510. Its totient is φ = 17160018095976.

The previous prime is 20020021111999. The next prime is 20020021112033. The reversal of 20020021112021 is 12021112002002.

It can be written as a sum of positive squares in only one way, i.e., 17479548531025 + 2540472580996 = 4180855^2 + 1593886^2 .

It is not a de Polignac number, because 20020021112021 - 2¹⁰ = 20020021110997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20020021111987 and 20020021112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020021112521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204285929666 + ... + 204285929763.

It is an arithmetic number, because the mean of its divisors is an integer number (3881432664585).

Almost surely, 2^{20020021112021} is an apocalyptic number.

It is an amenable number.

20020021112021 is a deficient number, since it is larger than the sum of its proper divisors (3268574875489).

20020021112021 is an equidigital number, since it uses as much as digits as its factorization.

20020021112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408571859443 (or 408571859436 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20020021112021 its reverse (12021112002002), we get a palindrome (32041133114023).

The spelling of 20020021112021 in words is "twenty trillion, twenty billion, twenty-one million, one hundred twelve thousand, twenty-one".