2021200021021 has 8 divisors (see below), whose sum is σ = 2091142441080. Its totient is φ = 1951273992192.

The previous prime is 2021200021013. The next prime is 2021200021037. The reversal of 2021200021021 is 1201200021202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 732205376100 + 1288994644921 = 855690^2 + 1135339^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2021200021021 - 2³ = 2021200021013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021200020992 and 2021200021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021200021081) 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, 3846660 + ... + 4340413.

It is an arithmetic number, because the mean of its divisors is an integer number (261392805135).

Almost surely, 2^{2021200021021} is an apocalyptic number.

It is an amenable number.

2021200021021 is a deficient number, since it is larger than the sum of its proper divisors (69942420059).

2021200021021 is an equidigital number, since it uses as much as digits as its factorization.

2021200021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8195615.

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

Adding to 2021200021021 its reverse (1201200021202), we get a palindrome (3222400042223).

The spelling of 2021200021021 in words is "two trillion, twenty-one billion, two hundred million, twenty-one thousand, twenty-one".