210101010221 has 2 divisors, whose sum is σ = 210101010222. Its totient is φ = 210101010220.

The previous prime is 210101010211. The next prime is 210101010257. The reversal of 210101010221 is 122010101012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186676707721 + 23424302500 = 432061^2 + 153050^2 .

It is a cyclic number.

It is not a de Polignac number, because 210101010221 - 2¹⁰ = 210101009197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210101010211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050505110 + 105050505111.

It is an arithmetic number, because the mean of its divisors is an integer number (105050505111).

Almost surely, 2^210101010221 is an apocalyptic number.

It is an amenable number.

210101010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210101010221 is an equidigital number, since it uses as much as digits as its factorization.

210101010221 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.

Adding to 210101010221 its reverse (122010101012), we get a palindrome (332111111233).

The spelling of 210101010221 in words is "two hundred ten billion, one hundred one million, ten thousand, two hundred twenty-one".