11101120021 has 4 divisors (see below), whose sum is σ = 11337314112. Its totient is φ = 10864925932.

The previous prime is 11101119971. The next prime is 11101120067. The reversal of 11101120021 is 12002110111.

11101120021 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12002110111 = 457 ⋅26262823.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11101120021 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 (11101120421) 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, 118096975 + ... + 118097068.

It is an arithmetic number, because the mean of its divisors is an integer number (2834328528).

Almost surely, 2^11101120021 is an apocalyptic number.

It is an amenable number.

11101120021 is a deficient number, since it is larger than the sum of its proper divisors (236194091).

11101120021 is an equidigital number, since it uses as much as digits as its factorization.

11101120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236194090.

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

Adding to 11101120021 its reverse (12002110111), we get a palindrome (23103230132).

The spelling of 11101120021 in words is "eleven billion, one hundred one million, one hundred twenty thousand, twenty-one".