11213431221 has 32 divisors (see below), whose sum is σ = 15516389376. Its totient is φ = 7198632000.

The previous prime is 11213431211. The next prime is 11213431237. The reversal of 11213431221 is 12213431211.

It is not a de Polignac number, because 11213431221 - 2¹⁴ = 11213414837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213431211) 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 31 ways as a sum of consecutive naturals, for example, 6916791 + ... + 6918411.

It is an arithmetic number, because the mean of its divisors is an integer number (484887168).

Almost surely, 2^11213431221 is an apocalyptic number.

It is an amenable number.

11213431221 is a deficient number, since it is larger than the sum of its proper divisors (4302958155).

11213431221 is a wasteful number, since it uses less digits than its factorization.

11213431221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2433.

The product of its digits is 288, while the sum is 21.

Adding to 11213431221 its reverse (12213431211), we get a palindrome (23426862432).

The spelling of 11213431221 in words is "eleven billion, two hundred thirteen million, four hundred thirty-one thousand, two hundred twenty-one".