4385211221 has 4 divisors (see below), whose sum is σ = 4390884972. Its totient is φ = 4379537472.

The previous prime is 4385211209. The next prime is 4385211223. The reversal of 4385211221 is 1221125834.

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 308388721 + 4076822500 = 17561^2 + 63850^2 .

It is a cyclic number.

It is not a de Polignac number, because 4385211221 - 2⁶ = 4385211157 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 (4385211223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2835716 + ... + 2837261.

It is an arithmetic number, because the mean of its divisors is an integer number (1097721243).

Almost surely, 2^4385211221 is an apocalyptic number.

It is an amenable number.

4385211221 is a deficient number, since it is larger than the sum of its proper divisors (5673751).

4385211221 is an equidigital number, since it uses as much as digits as its factorization.

4385211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5673750.

The product of its digits is 3840, while the sum is 29.

The square root of 4385211221 is about 66220.9273643914. The cubic root of 4385211221 is about 1636.8046076004.

The spelling of 4385211221 in words is "four billion, three hundred eighty-five million, two hundred eleven thousand, two hundred twenty-one".