2021021202021 has 16 divisors (see below), whose sum is σ = 2712669872640. Its totient is φ = 1338360850800.

The previous prime is 2021021202001. The next prime is 2021021202043. The reversal of 2021021202021 is 1202021201202.

It is not a de Polignac number, because 2021021202021 - 2⁹ = 2021021201509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021021202001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10597650 + ... + 10786668.

It is an arithmetic number, because the mean of its divisors is an integer number (169541867040).

Almost surely, 2^{2021021202021} is an apocalyptic number.

It is an amenable number.

2021021202021 is a deficient number, since it is larger than the sum of its proper divisors (691648670619).

2021021202021 is a wasteful number, since it uses less digits than its factorization.

2021021202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212776.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2021021202021 its reverse (1202021201202), we get a palindrome (3223042403223).

The spelling of 2021021202021 in words is "two trillion, twenty-one billion, twenty-one million, two hundred two thousand, twenty-one".