45021 has 8 divisors (see below), whose sum is σ = 61600. Its totient is φ = 29232.

The previous prime is 45013. The next prime is 45053. The reversal of 45021 is 12054.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 45021 - 2³ = 45013 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 44988 and 45006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46 + ... + 303.

It is an arithmetic number, because the mean of its divisors is an integer number (7700).

2⁴⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

45021 is a deficient number, since it is larger than the sum of its proper divisors (16579).

45021 is a wasteful number, since it uses less digits than its factorization.

45021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 45021 is about 212.1815260573. The cubic root of 45021 is about 35.5744651296.

Adding to 45021 its reverse (12054), we get a palindrome (57075).

The spelling of 45021 in words is "forty-five thousand, twenty-one".