74421 has 6 divisors (see below), whose sum is σ = 107510. Its totient is φ = 49608.

The previous prime is 74419. The next prime is 74441. The reversal of 74421 is 12447.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 72900 + 1521 = 270^2 + 39^2 .

It is not a de Polignac number, because 74421 - 2¹ = 74419 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 74394 and 74403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74411) 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, 4126 + ... + 4143.

2⁷⁴⁴²¹ is an apocalyptic number.

It is an amenable number.

74421 is a deficient number, since it is larger than the sum of its proper divisors (33089).

74421 is a wasteful number, since it uses less digits than its factorization.

74421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8275 (or 8272 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 74421 is about 272.8021260914. The cubic root of 74421 is about 42.0628311291.

Adding to 74421 its reverse (12447), we get a palindrome (86868).

The spelling of 74421 in words is "seventy-four thousand, four hundred twenty-one", and thus it is an iban number.