18121131231013 has 8 divisors (see below), whose sum is σ = 18398046998240. Its totient is φ = 17844405202800.

The previous prime is 18121131231011. The next prime is 18121131231041. The reversal of 18121131231013 is 31013213112181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18121131231013 - 2¹ = 18121131231011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18121131231011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47242278 + ... + 47624311.

It is an arithmetic number, because the mean of its divisors is an integer number (2299755874780).

Almost surely, 2^{18121131231013} is an apocalyptic number.

It is an amenable number.

18121131231013 is a deficient number, since it is larger than the sum of its proper divisors (276915767227).

18121131231013 is an equidigital number, since it uses as much as digits as its factorization.

18121131231013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94869507.

The product of its (nonzero) digits is 864, while the sum is 28.

Adding to 18121131231013 its reverse (31013213112181), we get a palindrome (49134344343194).

The spelling of 18121131231013 in words is "eighteen trillion, one hundred twenty-one billion, one hundred thirty-one million, two hundred thirty-one thousand, thirteen".