2021021222021 has 2 divisors, whose sum is σ = 2021021222022. Its totient is φ = 2021021222020.

The previous prime is 2021021221969. The next prime is 2021021222063. The reversal of 2021021222021 is 1202221201202.

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., 1992473402500 + 28547819521 = 1411550^2 + 168961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021021222021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021027222021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010510611010 + 1010510611011.

It is an arithmetic number, because the mean of its divisors is an integer number (1010510611011).

Almost surely, 2^{2021021222021} is an apocalyptic number.

It is an amenable number.

2021021222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021021222021 is an equidigital number, since it uses as much as digits as its factorization.

2021021222021 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 2021021222021 its reverse (1202221201202), we get a palindrome (3223242423223).

The spelling of 2021021222021 in words is "two trillion, twenty-one billion, twenty-one million, two hundred twenty-two thousand, twenty-one".