13211440421 has 4 divisors (see below), whose sum is σ = 13435363200. Its totient is φ = 12987517644.

The previous prime is 13211440399. The next prime is 13211440447. The reversal of 13211440421 is 12404411231.

13211440421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13211440421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13211440621) 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 3 ways as a sum of consecutive naturals, for example, 111961301 + ... + 111961418.

It is an arithmetic number, because the mean of its divisors is an integer number (3358840800).

Almost surely, 2^13211440421 is an apocalyptic number.

It is an amenable number.

13211440421 is a deficient number, since it is larger than the sum of its proper divisors (223922779).

13211440421 is an equidigital number, since it uses as much as digits as its factorization.

13211440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223922778.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 13211440421 its reverse (12404411231), we get a palindrome (25615851652).

The spelling of 13211440421 in words is "thirteen billion, two hundred eleven million, four hundred forty thousand, four hundred twenty-one".