13321167621 has 4 divisors (see below), whose sum is σ = 17761556832. Its totient is φ = 8880778412.

The previous prime is 13321167619. The next prime is 13321167701. The reversal of 13321167621 is 12676112331.

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 not a de Polignac number, because 13321167621 - 2¹ = 13321167619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13321167521) 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, 2220194601 + ... + 2220194606.

It is an arithmetic number, because the mean of its divisors is an integer number (4440389208).

Almost surely, 2^13321167621 is an apocalyptic number.

It is an amenable number.

13321167621 is a deficient number, since it is larger than the sum of its proper divisors (4440389211).

13321167621 is an equidigital number, since it uses as much as digits as its factorization.

13321167621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440389210.

The product of its digits is 9072, while the sum is 33.

Adding to 13321167621 its reverse (12676112331), we get a palindrome (25997279952).

The spelling of 13321167621 in words is "thirteen billion, three hundred twenty-one million, one hundred sixty-seven thousand, six hundred twenty-one".