11031311221 has 16 divisors (see below), whose sum is σ = 13159160064. Its totient is φ = 9041687424.

The previous prime is 11031311209. The next prime is 11031311231. The reversal of 11031311221 is 12211313011.

It is a happy number.

It is not a de Polignac number, because 11031311221 - 2⁹ = 11031310709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11031311195 and 11031311204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11031311231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 709891 + ... + 725263.

It is an arithmetic number, because the mean of its divisors is an integer number (822447504).

Almost surely, 2^11031311221 is an apocalyptic number.

It is an amenable number.

11031311221 is a deficient number, since it is larger than the sum of its proper divisors (2127848843).

11031311221 is a wasteful number, since it uses less digits than its factorization.

11031311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19860.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11031311221 its reverse (12211313011), we get a palindrome (23242624232).

The spelling of 11031311221 in words is "eleven billion, thirty-one million, three hundred eleven thousand, two hundred twenty-one".