10121101121221 has 4 divisors (see below), whose sum is σ = 10164539323692. Its totient is φ = 10077662918752.

The previous prime is 10121101121203. The next prime is 10121101121227. The reversal of 10121101121221 is 12212110112101.

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 924984221121 + 9196116900100 = 961761^2 + 3032510^2 .

It is a cyclic number.

It is not a de Polignac number, because 10121101121221 - 2⁷ = 10121101121093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10121101121195 and 10121101121204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121101121227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21719100886 + ... + 21719101351.

It is an arithmetic number, because the mean of its divisors is an integer number (2541134830923).

Almost surely, 2^{10121101121221} is an apocalyptic number.

It is an amenable number.

10121101121221 is a deficient number, since it is larger than the sum of its proper divisors (43438202471).

10121101121221 is an equidigital number, since it uses as much as digits as its factorization.

10121101121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43438202470.

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

Adding to 10121101121221 its reverse (12212110112101), we get a palindrome (22333211233322).

The spelling of 10121101121221 in words is "ten trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty-one thousand, two hundred twenty-one".