20020021021021 has 16 divisors (see below), whose sum is σ = 23669162231040. Its totient is φ = 16568172956160.

The previous prime is 20020021021003. The next prime is 20020021021027. The reversal of 20020021021021 is 12012012002002.

It is a happy number.

It is not a de Polignac number, because 20020021021021 - 2³⁷ = 19882582067549 is a prime.

It is a Duffinian number.

20020021021021 is a modest number, since divided by 21021021 gives 20020 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20020021020992 and 20020021021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020021021027) 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 15 ways as a sum of consecutive naturals, for example, 37507405 + ... + 38037421.

It is an arithmetic number, because the mean of its divisors is an integer number (1479322639440).

Almost surely, 2^{20020021021021} is an apocalyptic number.

It is an amenable number.

20020021021021 is a deficient number, since it is larger than the sum of its proper divisors (3649141210019).

20020021021021 is a wasteful number, since it uses less digits than its factorization.

20020021021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716124.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20020021021021 its reverse (12012012002002), we get a palindrome (32032033023023).

The spelling of 20020021021021 in words is "twenty trillion, twenty billion, twenty-one million, twenty-one thousand, twenty-one".