2021222110021 has 2 divisors, whose sum is σ = 2021222110022. Its totient is φ = 2021222110020.

The previous prime is 2021222110009. The next prime is 2021222110027. The reversal of 2021222110021 is 1200112221202.

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., 1806147844900 + 215074265121 = 1343930^2 + 463761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021222110021 - 2¹¹ = 2021222107973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021222109977 and 2021222110004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021222110027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010611055010 + 1010611055011.

It is an arithmetic number, because the mean of its divisors is an integer number (1010611055011).

Almost surely, 2^{2021222110021} is an apocalyptic number.

It is an amenable number.

2021222110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021222110021 is an equidigital number, since it uses as much as digits as its factorization.

2021222110021 is an evil number, because the sum of its binary digits is even.

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

Adding to 2021222110021 its reverse (1200112221202), we get a palindrome (3221334331223).

The spelling of 2021222110021 in words is "two trillion, twenty-one billion, two hundred twenty-two million, one hundred ten thousand, twenty-one".