4430621221 has 4 divisors (see below), whose sum is σ = 4771438252. Its totient is φ = 4089804192.

The previous prime is 4430621219. The next prime is 4430621233. The reversal of 4430621221 is 1221260344.

It is a happy number.

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 594676996 + 3835944225 = 24386^2 + 61935^2 .

It is a cyclic number.

It is not a de Polignac number, because 4430621221 - 2¹ = 4430621219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4430621201) 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 3 ways as a sum of consecutive naturals, for example, 170408496 + ... + 170408521.

It is an arithmetic number, because the mean of its divisors is an integer number (1192859563).

Almost surely, 2^4430621221 is an apocalyptic number.

It is an amenable number.

4430621221 is a deficient number, since it is larger than the sum of its proper divisors (340817031).

4430621221 is a wasteful number, since it uses less digits than its factorization.

4430621221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340817030.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 4430621221 is about 66562.9117527171. The cubic root of 4430621221 is about 1642.4350626207.

Adding to 4430621221 its reverse (1221260344), we get a palindrome (5651881565).

The spelling of 4430621221 in words is "four billion, four hundred thirty million, six hundred twenty-one thousand, two hundred twenty-one".