11103131221 has 16 divisors (see below), whose sum is σ = 13668044544. Its totient is φ = 8783190144.

The previous prime is 11103131209. The next prime is 11103131233. The reversal of 11103131221 is 12213130111.

It is a happy number.

11103131221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11103131209) and next prime (11103131233).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11103131221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11103131195 and 11103131204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11103131261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681456 + ... + 697558.

It is an arithmetic number, because the mean of its divisors is an integer number (854252784).

Almost surely, 2^11103131221 is an apocalyptic number.

It is an amenable number.

11103131221 is a deficient number, since it is larger than the sum of its proper divisors (2564913323).

11103131221 is a wasteful number, since it uses less digits than its factorization.

11103131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23700.

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

Adding to 11103131221 its reverse (12213130111), we get a palindrome (23316261332).

The spelling of 11103131221 in words is "eleven billion, one hundred three million, one hundred thirty-one thousand, two hundred twenty-one".