13221774431 has 4 divisors (see below), whose sum is σ = 13224621864. Its totient is φ = 13218927000.

The previous prime is 13221774413. The next prime is 13221774437. The reversal of 13221774431 is 13447712231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13221774431 - 2¹⁸ = 13221512287 is a prime.

It is a super-2 number, since 2×13221774431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13221774391 and 13221774400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221774437) 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, 1416740 + ... + 1426041.

It is an arithmetic number, because the mean of its divisors is an integer number (3306155466).

Almost surely, 2^13221774431 is an apocalyptic number.

13221774431 is a deficient number, since it is larger than the sum of its proper divisors (2847433).

13221774431 is an equidigital number, since it uses as much as digits as its factorization.

13221774431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847432.

The product of its digits is 28224, while the sum is 35.

The spelling of 13221774431 in words is "thirteen billion, two hundred twenty-one million, seven hundred seventy-four thousand, four hundred thirty-one".