45004021 has 4 divisors (see below), whose sum is σ = 45252844. Its totient is φ = 44755200.

The previous prime is 45004013. The next prime is 45004039. The reversal of 45004021 is 12040054.

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 7365796 + 37638225 = 2714^2 + 6135^2 .

It is a cyclic number.

It is not a de Polignac number, because 45004021 - 2³ = 45004013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45003986 and 45004004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45004081) 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, 124140 + ... + 124501.

It is an arithmetic number, because the mean of its divisors is an integer number (11313211).

Almost surely, 2^45004021 is an apocalyptic number.

It is an amenable number.

45004021 is a deficient number, since it is larger than the sum of its proper divisors (248823).

45004021 is a wasteful number, since it uses less digits than its factorization.

45004021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248822.

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

The square root of 45004021 is about 6708.5036334491. The cubic root of 45004021 is about 355.6999244060.

Adding to 45004021 its reverse (12040054), we get a palindrome (57044075).

The spelling of 45004021 in words is "forty-five million, four thousand, twenty-one".