13121021323231 has 4 divisors (see below), whose sum is σ = 13268448529200. Its totient is φ = 12973594117264.

The previous prime is 13121021323229. The next prime is 13121021323283. The reversal of 13121021323231 is 13232312012131.

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 13121021323231 - 2¹ = 13121021323229 is a prime.

It is a super-2 number, since 2×13121021323231² (a number of 27 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 = 13121021323196 and 13121021323205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121021329231) 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, 73713602851 + ... + 73713603028.

It is an arithmetic number, because the mean of its divisors is an integer number (3317112132300).

Almost surely, 2^{13121021323231} is an apocalyptic number.

13121021323231 is a deficient number, since it is larger than the sum of its proper divisors (147427205969).

13121021323231 is an equidigital number, since it uses as much as digits as its factorization.

13121021323231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147427205968.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 13121021323231 its reverse (13232312012131), we get a palindrome (26353333335362).

The spelling of 13121021323231 in words is "thirteen trillion, one hundred twenty-one billion, twenty-one million, three hundred twenty-three thousand, two hundred thirty-one".