18614221 has 4 divisors (see below), whose sum is σ = 18717244. Its totient is φ = 18511200.

The previous prime is 18614213. The next prime is 18614249. The reversal of 18614221 is 12241681.

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 9066121 + 9548100 = 3011^2 + 3090^2 .

It is a cyclic number.

It is not a de Polignac number, because 18614221 - 2³ = 18614213 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 (18614251) 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, 51240 + ... + 51601.

It is an arithmetic number, because the mean of its divisors is an integer number (4679311).

Almost surely, 2^18614221 is an apocalyptic number.

It is an amenable number.

18614221 is a deficient number, since it is larger than the sum of its proper divisors (103023).

18614221 is a wasteful number, since it uses less digits than its factorization.

18614221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103022.

The product of its digits is 768, while the sum is 25.

The square root of 18614221 is about 4314.4201232611. The cubic root of 18614221 is about 265.0218137971.

The spelling of 18614221 in words is "eighteen million, six hundred fourteen thousand, two hundred twenty-one".