11031331021 has 4 divisors (see below), whose sum is σ = 11057659200. Its totient is φ = 11005002844.

The previous prime is 11031331009. The next prime is 11031331027. The reversal of 11031331021 is 12013313011.

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 a de Polignac number, because none of the positive numbers 2^k-11031331021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11031330986 and 11031331004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11031331027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13163461 + ... + 13164298.

It is an arithmetic number, because the mean of its divisors is an integer number (2764414800).

Almost surely, 2^11031331021 is an apocalyptic number.

It is an amenable number.

11031331021 is a deficient number, since it is larger than the sum of its proper divisors (26328179).

11031331021 is an equidigital number, since it uses as much as digits as its factorization.

11031331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26328178.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 11031331021 its reverse (12013313011), we get a palindrome (23044644032).

The spelling of 11031331021 in words is "eleven billion, thirty-one million, three hundred thirty-one thousand, twenty-one".