45042021 has 16 divisors (see below), whose sum is σ = 67032000. Its totient is φ = 29891664.

The previous prime is 45042007. The next prime is 45042059. The reversal of 45042021 is 12024054.

It is not a de Polignac number, because 45042021 - 2¹⁴ = 45025637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 45041985 and 45042003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45042001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2455 + ... + 9803.

It is an arithmetic number, because the mean of its divisors is an integer number (4189500).

Almost surely, 2^45042021 is an apocalyptic number.

It is an amenable number.

45042021 is a deficient number, since it is larger than the sum of its proper divisors (21989979).

45042021 is a wasteful number, since it uses less digits than its factorization.

45042021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7585 (or 7579 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 45042021 is about 6711.3352620771. The cubic root of 45042021 is about 355.8000102375.

Adding to 45042021 its reverse (12024054), we get a palindrome (57066075).

The spelling of 45042021 in words is "forty-five million, forty-two thousand, twenty-one".