11221000121 has 4 divisors (see below), whose sum is σ = 11279140212. Its totient is φ = 11162860032.

The previous prime is 11221000079. The next prime is 11221000139. The reversal of 11221000121 is 12100012211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12100012211 = 7 ⋅1728573173.

It can be written as a sum of positive squares in 2 ways, for example, as 5915917225 + 5305082896 = 76915^2 + 72836^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221000121 - 2⁶ = 11221000057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11221000151) 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, 29069756 + ... + 29070141.

It is an arithmetic number, because the mean of its divisors is an integer number (2819785053).

Almost surely, 2^11221000121 is an apocalyptic number.

It is an amenable number.

11221000121 is a deficient number, since it is larger than the sum of its proper divisors (58140091).

11221000121 is an equidigital number, since it uses as much as digits as its factorization.

11221000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58140090.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11221000121 its reverse (12100012211), we get a palindrome (23321012332).

The spelling of 11221000121 in words is "eleven billion, two hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.