182421 has 6 divisors (see below), whose sum is σ = 263510. Its totient is φ = 121608.

The previous prime is 182417. The next prime is 182423. The reversal of 182421 is 124281.

It can be written as a sum of positive squares in only one way, i.e., 171396 + 11025 = 414^2 + 105^2 .

It is not a de Polignac number, because 182421 - 2² = 182417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 182394 and 182403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (182423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10126 + ... + 10143.

2¹⁸²⁴²¹ is an apocalyptic number.

It is an amenable number.

182421 is a deficient number, since it is larger than the sum of its proper divisors (81089).

182421 is a wasteful number, since it uses less digits than its factorization.

182421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20275 (or 20272 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 182421 is about 427.1077147512. The cubic root of 182421 is about 56.7141739245.

The spelling of 182421 in words is "one hundred eighty-two thousand, four hundred twenty-one".