11001220121 has 4 divisors (see below), whose sum is σ = 11048435892. Its totient is φ = 10954004352.

The previous prime is 11001220073. The next prime is 11001220127. The reversal of 11001220121 is 12102210011.

11001220121 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 4499055625 + 6502164496 = 67075^2 + 80636^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001220121 - 2¹⁸ = 11000957977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11001220127) 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, 23607536 + ... + 23608001.

It is an arithmetic number, because the mean of its divisors is an integer number (2762108973).

Almost surely, 2^11001220121 is an apocalyptic number.

It is an amenable number.

11001220121 is a deficient number, since it is larger than the sum of its proper divisors (47215771).

11001220121 is an equidigital number, since it uses as much as digits as its factorization.

11001220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47215770.

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

Adding to 11001220121 its reverse (12102210011), we get a palindrome (23103430132).

It can be divided in two parts, 1100 and 1220121, that added together give a palindrome (1221221).

The spelling of 11001220121 in words is "eleven billion, one million, two hundred twenty thousand, one hundred twenty-one".