4213217221 has 4 divisors (see below), whose sum is σ = 4251870700. Its totient is φ = 4174563744.

The previous prime is 4213217171. The next prime is 4213217279. The reversal of 4213217221 is 1227123124.

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 1114624996 + 3098592225 = 33386^2 + 55665^2 .

It is a cyclic number.

It is not a de Polignac number, because 4213217221 - 2²⁷ = 4078999493 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 (4213247221) 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, 19326576 + ... + 19326793.

It is an arithmetic number, because the mean of its divisors is an integer number (1062967675).

Almost surely, 2^4213217221 is an apocalyptic number.

It is an amenable number.

4213217221 is a deficient number, since it is larger than the sum of its proper divisors (38653479).

4213217221 is a wasteful number, since it uses less digits than its factorization.

4213217221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38653478.

The product of its digits is 1344, while the sum is 25.

The square root of 4213217221 is about 64909.2999577102. The cubic root of 4213217221 is about 1615.1193374803.

The spelling of 4213217221 in words is "four billion, two hundred thirteen million, two hundred seventeen thousand, two hundred twenty-one".