18230421 has 16 divisors (see below), whose sum is σ = 27671040. Its totient is φ = 10567920.

The previous prime is 18230419. The next prime is 18230423. The reversal of 18230421 is 12403281.

It is an interprime number because it is at equal distance from previous prime (18230419) and next prime (18230423).

It is not a de Polignac number, because 18230421 - 2¹ = 18230419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18230423) 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 15 ways as a sum of consecutive naturals, for example, 11251 + ... + 12768.

It is an arithmetic number, because the mean of its divisors is an integer number (1729440).

Almost surely, 2^18230421 is an apocalyptic number.

18230421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18230421 is a deficient number, since it is larger than the sum of its proper divisors (9440619).

18230421 is a wasteful number, since it uses less digits than its factorization.

18230421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24056.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18230421 is about 4269.7097091020. The cubic root of 18230421 is about 263.1876861985.

It can be divided in two parts, 182 and 30421, that added together give a palindrome (30603).

The spelling of 18230421 in words is "eighteen million, two hundred thirty thousand, four hundred twenty-one".