21010201010221 has 2 divisors, whose sum is σ = 21010201010222. Its totient is φ = 21010201010220.

The previous prime is 21010201010171. The next prime is 21010201010233. The reversal of 21010201010221 is 12201010201012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14644742654025 + 6365458356196 = 3826845^2 + 2522986^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010201010221 - 2²⁹ = 21009664139309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010201010291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505100505110 + 10505100505111.

It is an arithmetic number, because the mean of its divisors is an integer number (10505100505111).

Almost surely, 2^{21010201010221} is an apocalyptic number.

It is an amenable number.

21010201010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010201010221 is an equidigital number, since it uses as much as digits as its factorization.

21010201010221 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 13.

Adding to 21010201010221 its reverse (12201010201012), we get a palindrome (33211211211233).

The spelling of 21010201010221 in words is "twenty-one trillion, ten billion, two hundred one million, ten thousand, two hundred twenty-one".