1021201110221 has 2 divisors, whose sum is σ = 1021201110222. Its totient is φ = 1021201110220.

The previous prime is 1021201110199. The next prime is 1021201110253. The reversal of 1021201110221 is 1220111021201.

1021201110221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1018898454025 + 2302656196 = 1009405^2 + 47986^2 .

It is an emirp because it is prime and its reverse (1220111021201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021201110221 - 2³⁰ = 1020127368397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021201110196 and 1021201110205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021201110521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510600555110 + 510600555111.

It is an arithmetic number, because the mean of its divisors is an integer number (510600555111).

Almost surely, 2^{1021201110221} is an apocalyptic number.

It is an amenable number.

1021201110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021201110221 is an equidigital number, since it uses as much as digits as its factorization.

1021201110221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021201110221 its reverse (1220111021201), we get a palindrome (2241312131422).

The spelling of 1021201110221 in words is "one trillion, twenty-one billion, two hundred one million, one hundred ten thousand, two hundred twenty-one".