10011001121221 has 4 divisors (see below), whose sum is σ = 10016711905132. Its totient is φ = 10005290337312.

The previous prime is 10011001121213. The next prime is 10011001121257. The reversal of 10011001121221 is 12212110011001.

It is a happy number.

10011001121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1040167452996 + 8970833668225 = 1019886^2 + 2995135^2 .

It is a cyclic number.

It is not a de Polignac number, because 10011001121221 - 2³ = 10011001121213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011001121281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2855389326 + ... + 2855392831.

It is an arithmetic number, because the mean of its divisors is an integer number (2504177976283).

Almost surely, 2^{10011001121221} is an apocalyptic number.

It is an amenable number.

10011001121221 is a deficient number, since it is larger than the sum of its proper divisors (5710783911).

10011001121221 is an equidigital number, since it uses as much as digits as its factorization.

10011001121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5710783910.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 10011001121221 its reverse (12212110011001), we get a palindrome (22223111132222).

The spelling of 10011001121221 in words is "ten trillion, eleven billion, one million, one hundred twenty-one thousand, two hundred twenty-one".