45421 has 4 divisors (see below), whose sum is σ = 46332. Its totient is φ = 44512.

The previous prime is 45413. The next prime is 45427. The reversal of 45421 is 12454.

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 38025 + 7396 = 195^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 45421 - 2³ = 45413 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 45395 and 45404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45427) 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, 376 + ... + 481.

It is an arithmetic number, because the mean of its divisors is an integer number (11583).

2⁴⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

45421 is a deficient number, since it is larger than the sum of its proper divisors (911).

45421 is an equidigital number, since it uses as much as digits as its factorization.

45421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910.

The product of its digits is 160, while the sum is 16.

The square root of 45421 is about 213.1220307711. The cubic root of 45421 is about 35.6795112946.

Adding to 45421 its reverse (12454), we get a palindrome (57875).

The spelling of 45421 in words is "forty-five thousand, four hundred twenty-one".