4428252221 has 4 divisors (see below), whose sum is σ = 4432290012. Its totient is φ = 4424214432.

The previous prime is 4428252217. The next prime is 4428252229. The reversal of 4428252221 is 1222528244.

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 2663076025 + 1765176196 = 51605^2 + 42014^2 .

It is a cyclic number.

It is not a de Polignac number, because 4428252221 - 2² = 4428252217 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 (4428252229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2017250 + ... + 2019443.

It is an arithmetic number, because the mean of its divisors is an integer number (1108072503).

Almost surely, 2^4428252221 is an apocalyptic number.

It is an amenable number.

4428252221 is a deficient number, since it is larger than the sum of its proper divisors (4037791).

4428252221 is a wasteful number, since it uses less digits than its factorization.

4428252221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037790.

The product of its digits is 20480, while the sum is 32.

The square root of 4428252221 is about 66545.1141782776. The cubic root of 4428252221 is about 1642.1422803258.

The spelling of 4428252221 in words is "four billion, four hundred twenty-eight million, two hundred fifty-two thousand, two hundred twenty-one".