13213440231 has 4 divisors (see below), whose sum is σ = 17617920312. Its totient is φ = 8808960152.

The previous prime is 13213440221. The next prime is 13213440293. The reversal of 13213440231 is 13204431231.

It is a happy number.

13213440231 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 an emirpimes, since its reverse is a distinct semiprime: 13204431231 = 3 ⋅4401477077.

It is a cyclic number.

It is not a de Polignac number, because 13213440231 - 2⁷ = 13213440103 is a prime.

It is a super-2 number, since 2×13213440231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13213440221) 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, 2202240036 + ... + 2202240041.

It is an arithmetic number, because the mean of its divisors is an integer number (4404480078).

Almost surely, 2^13213440231 is an apocalyptic number.

13213440231 is a deficient number, since it is larger than the sum of its proper divisors (4404480081).

13213440231 is an equidigital number, since it uses as much as digits as its factorization.

13213440231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404480080.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 13213440231 its reverse (13204431231), we get a palindrome (26417871462).

The spelling of 13213440231 in words is "thirteen billion, two hundred thirteen million, four hundred forty thousand, two hundred thirty-one".