13331220431 has 4 divisors (see below), whose sum is σ = 13337537664. Its totient is φ = 13324903200.

The previous prime is 13331220407. The next prime is 13331220449. The reversal of 13331220431 is 13402213331.

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 13331220431 - 2⁶ = 13331220367 is a prime.

It is a super-2 number, since 2×13331220431² (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 = 13331220397 and 13331220406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13331220031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3155450 + ... + 3159671.

It is an arithmetic number, because the mean of its divisors is an integer number (3334384416).

Almost surely, 2^13331220431 is an apocalyptic number.

13331220431 is a deficient number, since it is larger than the sum of its proper divisors (6317233).

13331220431 is an equidigital number, since it uses as much as digits as its factorization.

13331220431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6317232.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 13331220431 its reverse (13402213331), we get a palindrome (26733433762).

The spelling of 13331220431 in words is "thirteen billion, three hundred thirty-one million, two hundred twenty thousand, four hundred thirty-one".