11521431224 has 16 divisors (see below), whose sum is σ = 21615033120. Its totient is φ = 5757422400.

The previous prime is 11521431217. The next prime is 11521431227. The reversal of 11521431224 is 42213412511.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 11521431193 and 11521431202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521431227) 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 3 ways as a sum of consecutive naturals, for example, 396752 + ... + 424799.

It is an arithmetic number, because the mean of its divisors is an integer number (1350939570).

Almost surely, 2^11521431224 is an apocalyptic number.

It is an amenable number.

11521431224 is a deficient number, since it is larger than the sum of its proper divisors (10093601896).

11521431224 is a wasteful number, since it uses less digits than its factorization.

11521431224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823310 (or 823306 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

Adding to 11521431224 its reverse (42213412511), we get a palindrome (53734843735).

The spelling of 11521431224 in words is "eleven billion, five hundred twenty-one million, four hundred thirty-one thousand, two hundred twenty-four".