11101020121 has 4 divisors (see below), whose sum is σ = 11101253044. Its totient is φ = 11100787200.

The previous prime is 11101020109. The next prime is 11101020163. The reversal of 11101020121 is 12102010111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12102010111 = 1499 ⋅8073389.

It can be written as a sum of positive squares in 2 ways, for example, as 3542630400 + 7558389721 = 59520^2 + 86939^2 .

It is a cyclic number.

It is not a de Polignac number, because 11101020121 - 2¹⁷ = 11100889049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11101020098 and 11101020107.

It is not an unprimeable number, because it can be changed into a prime (11101020101) 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 3 ways as a sum of consecutive naturals, for example, 16200 + ... + 149881.

It is an arithmetic number, because the mean of its divisors is an integer number (2775313261).

Almost surely, 2^11101020121 is an apocalyptic number.

It is an amenable number.

11101020121 is a deficient number, since it is larger than the sum of its proper divisors (232923).

11101020121 is an equidigital number, since it uses as much as digits as its factorization.

11101020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232922.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 11101020121 its reverse (12102010111), we get a palindrome (23203030232).

It can be divided in two parts, 111010 and 20121, that added together give a palindrome (131131).

The spelling of 11101020121 in words is "eleven billion, one hundred one million, twenty thousand, one hundred twenty-one".