13240123474021 has 4 divisors (see below), whose sum is σ = 13274692987392. Its totient is φ = 13205553960652.

The previous prime is 13240123474007. The next prime is 13240123474051. The reversal of 13240123474021 is 12047432104231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13240123474021 - 2¹⁷ = 13240123342949 is a prime.

It is a super-3 number, since 3×13240123474021³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13240123474051) 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, 17284756111 + ... + 17284756876.

It is an arithmetic number, because the mean of its divisors is an integer number (3318673246848).

Almost surely, 2^{13240123474021} is an apocalyptic number.

It is an amenable number.

13240123474021 is a deficient number, since it is larger than the sum of its proper divisors (34569513371).

13240123474021 is an equidigital number, since it uses as much as digits as its factorization.

13240123474021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34569513370.

The product of its (nonzero) digits is 32256, while the sum is 34.

Adding to 13240123474021 its reverse (12047432104231), we get a palindrome (25287555578252).

The spelling of 13240123474021 in words is "thirteen trillion, two hundred forty billion, one hundred twenty-three million, four hundred seventy-four thousand, twenty-one".