45218221 has 8 divisors (see below), whose sum is σ = 47053080. Its totient is φ = 43401792.

The previous prime is 45218219. The next prime is 45218231. The reversal of 45218221 is 12281254.

It can be written as a sum of positive squares in 4 ways, for example, as 15515721 + 29702500 = 3939^2 + 5450^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 45218221 - 2¹ = 45218219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45218231) 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, 511 + ... + 9523.

It is an arithmetic number, because the mean of its divisors is an integer number (5881635).

Almost surely, 2^45218221 is an apocalyptic number.

It is an amenable number.

45218221 is a deficient number, since it is larger than the sum of its proper divisors (1834859).

45218221 is a wasteful number, since it uses less digits than its factorization.

45218221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9215.

The product of its digits is 1280, while the sum is 25.

The square root of 45218221 is about 6724.4494941965. The cubic root of 45218221 is about 356.2633582351.

Adding to 45218221 its reverse (12281254), we get a palindrome (57499475).

The spelling of 45218221 in words is "forty-five million, two hundred eighteen thousand, two hundred twenty-one".