1021110221 has 2 divisors, whose sum is σ = 1021110222. Its totient is φ = 1021110220.

The previous prime is 1021110199. The next prime is 1021110247. The reversal of 1021110221 is 1220111201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678342025 + 342768196 = 26045^2 + 18514^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021110221 - 2⁶ = 1021110157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021110421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510555110 + 510555111.

It is an arithmetic number, because the mean of its divisors is an integer number (510555111).

Almost surely, 2^1021110221 is an apocalyptic number.

It is an amenable number.

1021110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021110221 is an equidigital number, since it uses as much as digits as its factorization.

1021110221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1021110221 is about 31954.8153022357. The cubic root of 1021110221 is about 1006.9877972860.

Adding to 1021110221 its reverse (1220111201), we get a palindrome (2241221422).

The spelling of 1021110221 in words is "one billion, twenty-one million, one hundred ten thousand, two hundred twenty-one".