10001222201221 has 2 divisors, whose sum is σ = 10001222201222. Its totient is φ = 10001222201220.

The previous prime is 10001222201177. The next prime is 10001222201227. The reversal of 10001222201221 is 12210222210001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9118956497121 + 882265704100 = 3019761^2 + 939290^2 .

It is an emirp because it is prime and its reverse (12210222210001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10001222201221 - 2³¹ = 9999074717573 is a prime.

It is a super-2 number, since 2×10001222201221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10001222201195 and 10001222201204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10001222201227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000611100610 + 5000611100611.

It is an arithmetic number, because the mean of its divisors is an integer number (5000611100611).

Almost surely, 2^{10001222201221} is an apocalyptic number.

It is an amenable number.

10001222201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001222201221 is an equidigital number, since it uses as much as digits as its factorization.

10001222201221 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 10001222201221 its reverse (12210222210001), we get a palindrome (22211444411222).

The spelling of 10001222201221 in words is "ten trillion, one billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty-one".