18415875421 has 8 divisors (see below), whose sum is σ = 18606610880. Its totient is φ = 18225369792.

The previous prime is 18415875383. The next prime is 18415875449. The reversal of 18415875421 is 12457851481.

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 18415875421 - 2⁹ = 18415874909 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 (18415875521) 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, 106021 + ... + 219253.

It is an arithmetic number, because the mean of its divisors is an integer number (2325826360).

Almost surely, 2^18415875421 is an apocalyptic number.

It is an amenable number.

18415875421 is a deficient number, since it is larger than the sum of its proper divisors (190735459).

18415875421 is a wasteful number, since it uses less digits than its factorization.

18415875421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114915.

The product of its digits is 358400, while the sum is 46.

The spelling of 18415875421 in words is "eighteen billion, four hundred fifteen million, eight hundred seventy-five thousand, four hundred twenty-one".