18713121138213 has 64 divisors (see below), whose sum is σ = 26976400883712. Its totient is φ = 11509480857600.

The previous prime is 18713121138209. The next prime is 18713121138223. The reversal of 18713121138213 is 31283112131781.

It is not a de Polignac number, because 18713121138213 - 2² = 18713121138209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18713121138223) 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 63 ways as a sum of consecutive naturals, for example, 288078888 + ... + 288143838.

It is an arithmetic number, because the mean of its divisors is an integer number (421506263808).

Almost surely, 2^{18713121138213} is an apocalyptic number.

It is an amenable number.

18713121138213 is a deficient number, since it is larger than the sum of its proper divisors (8263279745499).

18713121138213 is a wasteful number, since it uses less digits than its factorization.

18713121138213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66314.

The product of its digits is 48384, while the sum is 42.

Adding to 18713121138213 its reverse (31283112131781), we get a palindrome (49996233269994).

The spelling of 18713121138213 in words is "eighteen trillion, seven hundred thirteen billion, one hundred twenty-one million, one hundred thirty-eight thousand, two hundred thirteen".