11001121021 has 4 divisors (see below), whose sum is σ = 12001222944. Its totient is φ = 10001019100.

The previous prime is 11001121003. The next prime is 11001121037. The reversal of 11001121021 is 12012110011.

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.

It is a cyclic number.

It is not a de Polignac number, because 11001121021 - 2⁹ = 11001120509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001120989 and 11001121007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001121051) 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, 500050945 + ... + 500050966.

It is an arithmetic number, because the mean of its divisors is an integer number (3000305736).

Almost surely, 2^11001121021 is an apocalyptic number.

11001121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001121021 is a deficient number, since it is larger than the sum of its proper divisors (1000101923).

11001121021 is a wasteful number, since it uses less digits than its factorization.

11001121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000101922.

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

Adding to 11001121021 its reverse (12012110011), we get a palindrome (23013231032).

The spelling of 11001121021 in words is "eleven billion, one million, one hundred twenty-one thousand, twenty-one".