11331231313221 has 24 divisors (see below), whose sum is σ = 17385832551360. Its totient is φ = 7293666118032.

The previous prime is 11331231313211. The next prime is 11331231313247. The reversal of 11331231313221 is 12231313213311.

11331231313221 is a `hidden beast` number, since 1 + 1 + 3 + 3 + 123 + 1 + 313 + 221 = 666.

It is not a de Polignac number, because 11331231313221 - 2⁷ = 11331231313093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11331231313211) 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 23 ways as a sum of consecutive naturals, for example, 249486945 + ... + 249532358.

It is an arithmetic number, because the mean of its divisors is an integer number (724409689640).

Almost surely, 2^{11331231313221} is an apocalyptic number.

It is an amenable number.

11331231313221 is a deficient number, since it is larger than the sum of its proper divisors (6054601238139).

11331231313221 is an equidigital number, since it uses as much as digits as its factorization.

11331231313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499019370 (or 499019335 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

Adding to 11331231313221 its reverse (12231313213311), we get a palindrome (23562544526532).

The spelling of 11331231313221 in words is "eleven trillion, three hundred thirty-one billion, two hundred thirty-one million, three hundred thirteen thousand, two hundred twenty-one".