10021101221 has 2 divisors, whose sum is σ = 10021101222. Its totient is φ = 10021101220.

The previous prime is 10021101217. The next prime is 10021101263. The reversal of 10021101221 is 12210112001.

10021101221 is digitally balanced in base 3, 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., 8814580996 + 1206520225 = 93886^2 + 34735^2 .

It is an emirp because it is prime and its reverse (12210112001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10021101221 - 2² = 10021101217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10021101721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010550610 + 5010550611.

It is an arithmetic number, because the mean of its divisors is an integer number (5010550611).

Almost surely, 2^10021101221 is an apocalyptic number.

It is an amenable number.

10021101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021101221 is an equidigital number, since it uses as much as digits as its factorization.

10021101221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 10021101221 its reverse (12210112001), we get a palindrome (22231213222).

The spelling of 10021101221 in words is "ten billion, twenty-one million, one hundred one thousand, two hundred twenty-one".