13121333231 has 4 divisors (see below), whose sum is σ = 13121628912. Its totient is φ = 13121037552.

The previous prime is 13121333221. The next prime is 13121333233. The reversal of 13121333231 is 13233312131.

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 13121333231 - 2⁶ = 13121333167 is a prime.

It is a super-2 number, since 2×13121333231² (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 = 13121333197 and 13121333206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121333233) 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, 66275 + ... + 175028.

It is an arithmetic number, because the mean of its divisors is an integer number (3280407228).

Almost surely, 2^13121333231 is an apocalyptic number.

13121333231 is a deficient number, since it is larger than the sum of its proper divisors (295681).

13121333231 is an equidigital number, since it uses as much as digits as its factorization.

13121333231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295680.

The product of its digits is 972, while the sum is 23.

Adding to 13121333231 its reverse (13233312131), we get a palindrome (26354645362).

The spelling of 13121333231 in words is "thirteen billion, one hundred twenty-one million, three hundred thirty-three thousand, two hundred thirty-one".