201021022100221 has 2 divisors, whose sum is σ = 201021022100222. Its totient is φ = 201021022100220.

The previous prime is 201021022100201. The next prime is 201021022100251. The reversal of 201021022100221 is 122001220120102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200553322039225 + 467700060996 = 14161685^2 + 683886^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021022100221 - 2²³ = 201021013711613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201021022100195 and 201021022100204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201021022100201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510511050110 + 100510511050111.

It is an arithmetic number, because the mean of its divisors is an integer number (100510511050111).

Almost surely, 2^{201021022100221} is an apocalyptic number.

It is an amenable number.

201021022100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021022100221 is an equidigital number, since it uses as much as digits as its factorization.

201021022100221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 201021022100221 its reverse (122001220120102), we get a palindrome (323022242220323).

The spelling of 201021022100221 in words is "two hundred one trillion, twenty-one billion, twenty-two million, one hundred thousand, two hundred twenty-one".