2021012222221 has 2 divisors, whose sum is σ = 2021012222222. Its totient is φ = 2021012222220.

The previous prime is 2021012222179. The next prime is 2021012222227. The reversal of 2021012222221 is 1222222101202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2020986364996 + 25857225 = 1421614^2 + 5085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021012222221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021012222227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010506111110 + 1010506111111.

It is an arithmetic number, because the mean of its divisors is an integer number (1010506111111).

Almost surely, 2^{2021012222221} is an apocalyptic number.

It is an amenable number.

2021012222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021012222221 is an equidigital number, since it uses as much as digits as its factorization.

2021012222221 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 2021012222221 its reverse (1222222101202), we get a palindrome (3243234323423).

The spelling of 2021012222221 in words is "two trillion, twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".