10011221201221 has 4 divisors (see below), whose sum is σ = 10013491838700. Its totient is φ = 10008950563744.

The previous prime is 10011221201153. The next prime is 10011221201269. The reversal of 10011221201221 is 12210212211001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 229933676196 + 9781287525025 = 479514^2 + 3127505^2 .

It is a cyclic number.

It is not a de Polignac number, because 10011221201221 - 2³⁵ = 9976861462853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10011221201195 and 10011221201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011221201921) 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 in 3 ways as a sum of consecutive naturals, for example, 1135312126 + ... + 1135320943.

It is an arithmetic number, because the mean of its divisors is an integer number (2503372959675).

Almost surely, 2^{10011221201221} is an apocalyptic number.

It is an amenable number.

10011221201221 is a deficient number, since it is larger than the sum of its proper divisors (2270637479).

10011221201221 is an equidigital number, since it uses as much as digits as its factorization.

10011221201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270637478.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 10011221201221 its reverse (12210212211001), we get a palindrome (22221433412222).

The spelling of 10011221201221 in words is "ten trillion, eleven billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-one".