13220203231 has 4 divisors (see below), whose sum is σ = 13379482872. Its totient is φ = 13060923592.

The previous prime is 13220203181. The next prime is 13220203259. The reversal of 13220203231 is 13230202231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13230202231 = 73 ⋅181235647.

It is a cyclic number.

It is not a de Polignac number, because 13220203231 - 2⁹ = 13220202719 is a prime.

It is a super-2 number, since 2×13220203231² (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 = 13220203199 and 13220203208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220203261) 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, 79639696 + ... + 79639861.

It is an arithmetic number, because the mean of its divisors is an integer number (3344870718).

Almost surely, 2^13220203231 is an apocalyptic number.

13220203231 is a deficient number, since it is larger than the sum of its proper divisors (159279641).

13220203231 is an equidigital number, since it uses as much as digits as its factorization.

13220203231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159279640.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 13220203231 its reverse (13230202231), we get a palindrome (26450405462).

The spelling of 13220203231 in words is "thirteen billion, two hundred twenty million, two hundred three thousand, two hundred thirty-one".