2021201122021 has 2 divisors, whose sum is σ = 2021201122022. Its totient is φ = 2021201122020.

The previous prime is 2021201122013. The next prime is 2021201122043. The reversal of 2021201122021 is 1202211021202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1441944656100 + 579256465921 = 1200810^2 + 761089^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021201122021 - 2³ = 2021201122013 is a prime.

It is a super-2 number, since 2×2021201122021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2021201121986 and 2021201122004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021201122621) 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 as a sum of consecutive naturals, namely, 1010600561010 + 1010600561011.

It is an arithmetic number, because the mean of its divisors is an integer number (1010600561011).

Almost surely, 2^{2021201122021} is an apocalyptic number.

It is an amenable number.

2021201122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021201122021 is an equidigital number, since it uses as much as digits as its factorization.

2021201122021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2021201122021 its reverse (1202211021202), we get a palindrome (3223412143223).

The spelling of 2021201122021 in words is "two trillion, twenty-one billion, two hundred one million, one hundred twenty-two thousand, twenty-one".