10201211221 has 2 divisors, whose sum is σ = 10201211222. Its totient is φ = 10201211220.

The previous prime is 10201211219. The next prime is 10201211243. The reversal of 10201211221 is 12211210201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9148922500 + 1052288721 = 95650^2 + 32439^2 .

It is a cyclic number.

It is not a de Polignac number, because 10201211221 - 2¹ = 10201211219 is a prime.

Together with 10201211219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10201211621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100605610 + 5100605611.

It is an arithmetic number, because the mean of its divisors is an integer number (5100605611).

Almost surely, 2^10201211221 is an apocalyptic number.

It is an amenable number.

10201211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10201211221 is an equidigital number, since it uses as much as digits as its factorization.

10201211221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10201211221 its reverse (12211210201), we get a palindrome (22412421422).

The spelling of 10201211221 in words is "ten billion, two hundred one million, two hundred eleven thousand, two hundred twenty-one".