18851148342121 has 4 divisors (see below), whose sum is σ = 19360638837892. Its totient is φ = 18341657846352.

The previous prime is 18851148342119. The next prime is 18851148342163. The reversal of 18851148342121 is 12124384115881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14515612324096 + 4335536018025 = 3809936^2 + 2082195^2 .

It is a cyclic number.

It is not a de Polignac number, because 18851148342121 - 2¹ = 18851148342119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18851148342101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254745247830 + ... + 254745247903.

It is an arithmetic number, because the mean of its divisors is an integer number (4840159709473).

Almost surely, 2^{18851148342121} is an apocalyptic number.

It is an amenable number.

18851148342121 is a deficient number, since it is larger than the sum of its proper divisors (509490495771).

18851148342121 is an equidigital number, since it uses as much as digits as its factorization.

18851148342121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509490495770.

The product of its digits is 491520, while the sum is 49.

The spelling of 18851148342121 in words is "eighteen trillion, eight hundred fifty-one billion, one hundred forty-eight million, three hundred forty-two thousand, one hundred twenty-one".