2021022221021 has 2 divisors, whose sum is σ = 2021022221022. Its totient is φ = 2021022221020.

The previous prime is 2021022220991. The next prime is 2021022221047. The reversal of 2021022221021 is 1201222201202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1810881576100 + 210140644921 = 1345690^2 + 458411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021022221021 - 2¹⁴ = 2021022204637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021022223021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010511110510 + 1010511110511.

It is an arithmetic number, because the mean of its divisors is an integer number (1010511110511).

Almost surely, 2^{2021022221021} is an apocalyptic number.

It is an amenable number.

2021022221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021022221021 is an equidigital number, since it uses as much as digits as its factorization.

2021022221021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2021022221021 its reverse (1201222201202), we get a palindrome (3222244422223).

The spelling of 2021022221021 in words is "two trillion, twenty-one billion, twenty-two million, two hundred twenty-one thousand, twenty-one".