45040221 has 24 divisors (see below), whose sum is σ = 67042976. Its totient is φ = 29121120.

The previous prime is 45040213. The next prime is 45040223. The reversal of 45040221 is 12204054.

It is not a de Polignac number, because 45040221 - 2³ = 45040213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45040194 and 45040203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45040223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69726 + ... + 70368.

Almost surely, 2^45040221 is an apocalyptic number.

It is an amenable number.

45040221 is a deficient number, since it is larger than the sum of its proper divisors (22002755).

45040221 is a wasteful number, since it uses less digits than its factorization.

45040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 873 (or 870 counting only the distinct ones).

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

The square root of 45040221 is about 6711.2011592561. The cubic root of 45040221 is about 355.7952706000.

Adding to 45040221 its reverse (12204054), we get a palindrome (57244275).

The spelling of 45040221 in words is "forty-five million, forty thousand, two hundred twenty-one".