18427003121 has 2 divisors, whose sum is σ = 18427003122. Its totient is φ = 18427003120.

The previous prime is 18427003109. The next prime is 18427003169. The reversal of 18427003121 is 12130072481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14032771600 + 4394231521 = 118460^2 + 66289^2 .

It is an emirp because it is prime and its reverse (12130072481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18427003121 - 2¹⁸ = 18426740977 is a prime.

It is not a weakly prime, because it can be changed into another prime (18427003321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9213501560 + 9213501561.

It is an arithmetic number, because the mean of its divisors is an integer number (9213501561).

Almost surely, 2^18427003121 is an apocalyptic number.

It is an amenable number.

18427003121 is a deficient number, since it is larger than the sum of its proper divisors (1).

18427003121 is an equidigital number, since it uses as much as digits as its factorization.

18427003121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The spelling of 18427003121 in words is "eighteen billion, four hundred twenty-seven million, three thousand, one hundred twenty-one".