2021222222021 has 2 divisors, whose sum is σ = 2021222222022. Its totient is φ = 2021222222020.

The previous prime is 2021222221937. The next prime is 2021222222111. The reversal of 2021222222021 is 1202222221202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2002547632996 + 18674589025 = 1415114^2 + 136655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021222222021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021222221984 and 2021222222002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021222222521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010611111010 + 1010611111011.

It is an arithmetic number, because the mean of its divisors is an integer number (1010611111011).

Almost surely, 2^{2021222222021} is an apocalyptic number.

It is an amenable number.

2021222222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021222222021 is an equidigital number, since it uses as much as digits as its factorization.

2021222222021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 2021222222021 its reverse (1202222221202), we get a palindrome (3223444443223).

The spelling of 2021222222021 in words is "two trillion, twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, twenty-one".