4505213621 has 16 divisors (see below), whose sum is σ = 4627322880. Its totient is φ = 4384860480.

The previous prime is 4505213591. The next prime is 4505213677. The reversal of 4505213621 is 1263125054.

It is a cyclic number.

It is not a de Polignac number, because 4505213621 - 2¹⁰ = 4505212597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4505213521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5244290 + ... + 5245148.

It is an arithmetic number, because the mean of its divisors is an integer number (289207680).

Almost surely, 2^4505213621 is an apocalyptic number.

It is an amenable number.

4505213621 is a deficient number, since it is larger than the sum of its proper divisors (122109259).

4505213621 is a wasteful number, since it uses less digits than its factorization.

4505213621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 4505213621 is about 67120.8881124200. Note that the first 3 decimals coincide. The cubic root of 4505213621 is about 1651.6009708618.

Adding to 4505213621 its reverse (1263125054), we get a palindrome (5768338675).

The spelling of 4505213621 in words is "four billion, five hundred five million, two hundred thirteen thousand, six hundred twenty-one".