2020121210021 has 6 divisors (see below), whose sum is σ = 2145941908530. Its totient is φ = 1901290550336.

The previous prime is 2020121209991. The next prime is 2020121210071. The reversal of 2020121210021 is 1200121210202.

It can be written as a sum of positive squares in 3 ways, for example, as 241165459396 + 1778955750625 = 491086^2 + 1333775^2 .

It is not a de Polignac number, because 2020121210021 - 2¹⁰ = 2020121208997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2020121209978 and 2020121210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020121210071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3495019106 + ... + 3495019683.

It is an arithmetic number, because the mean of its divisors is an integer number (357656984755).

Almost surely, 2^{2020121210021} is an apocalyptic number.

It is an amenable number.

2020121210021 is a deficient number, since it is larger than the sum of its proper divisors (125820698509).

2020121210021 is an equidigital number, since it uses as much as digits as its factorization.

2020121210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6990038823 (or 6990038806 counting only the distinct ones).

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

Adding to 2020121210021 its reverse (1200121210202), we get a palindrome (3220242420223).

The spelling of 2020121210021 in words is "two trillion, twenty billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".