2021212202221 has 2 divisors, whose sum is σ = 2021212202222. Its totient is φ = 2021212202220.

The previous prime is 2021212202161. The next prime is 2021212202257. The reversal of 2021212202221 is 1222022121202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1208845275625 + 812366926596 = 1099475^2 + 901314^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021212202221 - 2⁹ = 2021212201709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021212202281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010606101110 + 1010606101111.

It is an arithmetic number, because the mean of its divisors is an integer number (1010606101111).

Almost surely, 2^{2021212202221} is an apocalyptic number.

It is an amenable number.

2021212202221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021212202221 is an equidigital number, since it uses as much as digits as its factorization.

2021212202221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 2021212202221 its reverse (1222022121202), we get a palindrome (3243234323423).

The spelling of 2021212202221 in words is "two trillion, twenty-one billion, two hundred twelve million, two hundred two thousand, two hundred twenty-one".