18227421 has 24 divisors (see below), whose sum is σ = 27316224. Its totient is φ = 11702880.

The previous prime is 18227371. The next prime is 18227437. The reversal of 18227421 is 12472281.

18227421 is a `hidden beast` number, since 18 + 227 + 421 = 666.

It is not a de Polignac number, because 18227421 - 2²¹ = 16130269 is a prime.

It is a super-2 number, since 2×18227421² = 664477752622482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18227491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42076 + ... + 42506.

It is an arithmetic number, because the mean of its divisors is an integer number (1138176).

Almost surely, 2^18227421 is an apocalyptic number.

It is an amenable number.

18227421 is a deficient number, since it is larger than the sum of its proper divisors (9088803).

18227421 is a wasteful number, since it uses less digits than its factorization.

18227421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 598 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 18227421 is about 4269.3583827081. The cubic root of 18227421 is about 263.1732486754.

The spelling of 18227421 in words is "eighteen million, two hundred twenty-seven thousand, four hundred twenty-one".