11021120021 has 4 divisors (see below), whose sum is σ = 11060064192. Its totient is φ = 10982175852.

The previous prime is 11021119999. The next prime is 11021120029. The reversal of 11021120021 is 12002112011.

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: 12002112011 = 23 ⋅521830957.

It is a cyclic number.

It is not a de Polignac number, because 11021120021 - 2³⁰ = 9947378197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11021119984 and 11021120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021120029) 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, 19471661 + ... + 19472226.

It is an arithmetic number, because the mean of its divisors is an integer number (2765016048).

Almost surely, 2^11021120021 is an apocalyptic number.

It is an amenable number.

11021120021 is a deficient number, since it is larger than the sum of its proper divisors (38944171).

11021120021 is an equidigital number, since it uses as much as digits as its factorization.

11021120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38944170.

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

Adding to 11021120021 its reverse (12002112011), we get a palindrome (23023232032).

The spelling of 11021120021 in words is "eleven billion, twenty-one million, one hundred twenty thousand, twenty-one".