11103331221 has 24 divisors (see below), whose sum is σ = 16477605144. Its totient is φ = 7199539200.

The previous prime is 11103331189. The next prime is 11103331271. The reversal of 11103331221 is 12213330111.

11103331221 is a `hidden beast` number, since 1 + 110 + 3 + 331 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4560300900 + 6543030321 = 67530^2 + 80889^2 .

It is not a de Polignac number, because 11103331221 - 2⁵ = 11103331189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11103331194 and 11103331203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11103331271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1394965 + ... + 1402901.

It is an arithmetic number, because the mean of its divisors is an integer number (686566881).

Almost surely, 2^11103331221 is an apocalyptic number.

It is an amenable number.

11103331221 is a deficient number, since it is larger than the sum of its proper divisors (5374273923).

11103331221 is a wasteful number, since it uses less digits than its factorization.

11103331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12181 (or 12178 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 11103331221 its reverse (12213330111), we get a palindrome (23316661332).

The spelling of 11103331221 in words is "eleven billion, one hundred three million, three hundred thirty-one thousand, two hundred twenty-one".