13215344421 has 4 divisors (see below), whose sum is σ = 17620459232. Its totient is φ = 8810229612.

The previous prime is 13215344407. The next prime is 13215344447. The reversal of 13215344421 is 12444351231.

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 not a de Polignac number, because 13215344421 - 2¹¹ = 13215342373 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 (13215344221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2202557401 + ... + 2202557406.

It is an arithmetic number, because the mean of its divisors is an integer number (4405114808).

Almost surely, 2^13215344421 is an apocalyptic number.

It is an amenable number.

13215344421 is a deficient number, since it is larger than the sum of its proper divisors (4405114811).

13215344421 is an equidigital number, since it uses as much as digits as its factorization.

13215344421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405114810.

The product of its digits is 11520, while the sum is 30.

Adding to 13215344421 its reverse (12444351231), we get a palindrome (25659695652).

The spelling of 13215344421 in words is "thirteen billion, two hundred fifteen million, three hundred forty-four thousand, four hundred twenty-one".