18605003421 has 4 divisors (see below), whose sum is σ = 24806671232. Its totient is φ = 12403335612.

The previous prime is 18605003399. The next prime is 18605003479. The reversal of 18605003421 is 12430050681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18605003421 - 2⁷ = 18605003293 is a prime.

It is a super-2 number, since 2×18605003421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18605003491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3100833901 + ... + 3100833906.

It is an arithmetic number, because the mean of its divisors is an integer number (6201667808).

Almost surely, 2^18605003421 is an apocalyptic number.

It is an amenable number.

18605003421 is a deficient number, since it is larger than the sum of its proper divisors (6201667811).

18605003421 is an equidigital number, since it uses as much as digits as its factorization.

18605003421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6201667810.

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 18605003421 in words is "eighteen billion, six hundred five million, three thousand, four hundred twenty-one".