11221020121 has 16 divisors (see below), whose sum is σ = 11683381248. Its totient is φ = 10765339200.

The previous prime is 11221020011. The next prime is 11221020137. The reversal of 11221020121 is 12102012211.

It is a cyclic number.

It is not a de Polignac number, because 11221020121 - 2⁷ = 11221019993 is a prime.

It is a super-2 number, since 2×11221020121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11221020191) 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 15 ways as a sum of consecutive naturals, for example, 1786216 + ... + 1792486.

It is an arithmetic number, because the mean of its divisors is an integer number (730211328).

Almost surely, 2^11221020121 is an apocalyptic number.

It is an amenable number.

11221020121 is a deficient number, since it is larger than the sum of its proper divisors (462361127).

11221020121 is a wasteful number, since it uses less digits than its factorization.

11221020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6792.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11221020121 its reverse (12102012211), we get a palindrome (23323032332).

The spelling of 11221020121 in words is "eleven billion, two hundred twenty-one million, twenty thousand, one hundred twenty-one".