13123440232123 has 4 divisors (see below), whose sum is σ = 14132935634608. Its totient is φ = 12113944829640.

The previous prime is 13123440232087. The next prime is 13123440232129. The reversal of 13123440232123 is 32123204432131.

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 13123440232123 - 2¹³ = 13123440223931 is a prime.

It is a super-2 number, since 2×13123440232123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13123440232129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504747701223 + ... + 504747701248.

It is an arithmetic number, because the mean of its divisors is an integer number (3533233908652).

Almost surely, 2^{13123440232123} is an apocalyptic number.

13123440232123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

13123440232123 is a deficient number, since it is larger than the sum of its proper divisors (1009495402485).

13123440232123 is a wasteful number, since it uses less digits than its factorization.

13123440232123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009495402484.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 13123440232123 its reverse (32123204432131), we get a palindrome (45246644664254).

The spelling of 13123440232123 in words is "thirteen trillion, one hundred twenty-three billion, four hundred forty million, two hundred thirty-two thousand, one hundred twenty-three".