20020100021021 has 8 divisors (see below), whose sum is σ = 21220819087680. Its totient is φ = 18821943857088.

The previous prime is 20020100020997. The next prime is 20020100021039. The reversal of 20020100021021 is 12012000102002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20020100021021 - 2²⁶ = 20020032912157 is a prime.

It is a super-3 number, since 3×20020100021021³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020100020993 and 20020100021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020100021041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640709591 + ... + 640740836.

It is an arithmetic number, because the mean of its divisors is an integer number (2652602385960).

Almost surely, 2^{20020100021021} is an apocalyptic number.

It is an amenable number.

20020100021021 is a deficient number, since it is larger than the sum of its proper divisors (1200719066659).

20020100021021 is a wasteful number, since it uses less digits than its factorization.

20020100021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281451363.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20020100021021 its reverse (12012000102002), we get a palindrome (32032100123023).

The spelling of 20020100021021 in words is "twenty trillion, twenty billion, one hundred million, twenty-one thousand, twenty-one".