13223515421 has 4 divisors (see below), whose sum is σ = 13261405500. Its totient is φ = 13185625344.

The previous prime is 13223515387. The next prime is 13223515427. The reversal of 13223515421 is 12451532231.

13223515421 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.

It can be written as a sum of positive squares in 2 ways, for example, as 3456146521 + 9767368900 = 58789^2 + 98830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13223515421 is a prime.

It is a super-2 number, since 2×13223515421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13223515427) 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, 18944516 + ... + 18945213.

It is an arithmetic number, because the mean of its divisors is an integer number (3315351375).

Almost surely, 2^13223515421 is an apocalyptic number.

It is an amenable number.

13223515421 is a deficient number, since it is larger than the sum of its proper divisors (37890079).

13223515421 is an equidigital number, since it uses as much as digits as its factorization.

13223515421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37890078.

The product of its digits is 7200, while the sum is 29.

The spelling of 13223515421 in words is "thirteen billion, two hundred twenty-three million, five hundred fifteen thousand, four hundred twenty-one".