11001321011 has 4 divisors (see below), whose sum is σ = 11001643800. Its totient is φ = 11000998224.

The previous prime is 11001320947. The next prime is 11001321017. The reversal of 11001321011 is 11012310011.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11001321011 - 2⁶ = 11001320947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001320983 and 11001321001.

It is not an unprimeable number, because it can be changed into a prime (11001321017) 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, 103301 + ... + 180758.

It is an arithmetic number, because the mean of its divisors is an integer number (2750410950).

Almost surely, 2^11001321011 is an apocalyptic number.

11001321011 is a deficient number, since it is larger than the sum of its proper divisors (322789).

11001321011 is an equidigital number, since it uses as much as digits as its factorization.

11001321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322788.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 11001321011 its reverse (11012310011), we get a palindrome (22013631022).

The spelling of 11001321011 in words is "eleven billion, one million, three hundred twenty-one thousand, eleven".