18345021 has 8 divisors (see below), whose sum is σ = 24697920. Its totient is φ = 12111072.

The previous prime is 18345017. The next prime is 18345031. The reversal of 18345021 is 12054381.

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

It is not a de Polignac number, because 18345021 - 2² = 18345017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18344982 and 18345000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18345011) 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, 29376 + ... + 29993.

It is an arithmetic number, because the mean of its divisors is an integer number (3087240).

Almost surely, 2^18345021 is an apocalyptic number.

It is an amenable number.

18345021 is a deficient number, since it is larger than the sum of its proper divisors (6352899).

18345021 is a wasteful number, since it uses less digits than its factorization.

18345021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59475.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 18345021 is about 4283.1088008595. The cubic root of 18345021 is about 263.7380177691.

The spelling of 18345021 in words is "eighteen million, three hundred forty-five thousand, twenty-one".