43204221 has 12 divisors (see below), whose sum is σ = 62980060. Its totient is φ = 28537920.

The previous prime is 43204219. The next prime is 43204223. The reversal of 43204221 is 12240234.

It is an interprime number because it is at equal distance from previous prime (43204219) and next prime (43204223).

It can be written as a sum of positive squares in 2 ways, for example, as 27092025 + 16112196 = 5205^2 + 4014^2 .

It is not a de Polignac number, because 43204221 - 2¹ = 43204219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43204194 and 43204203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43204223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21040 + ... + 23001.

Almost surely, 2^43204221 is an apocalyptic number.

It is an amenable number.

43204221 is a deficient number, since it is larger than the sum of its proper divisors (19775839).

43204221 is a wasteful number, since it uses less digits than its factorization.

43204221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44156 (or 44153 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 43204221 is about 6572.9917845681. The cubic root of 43204221 is about 350.8935562494.

Adding to 43204221 its reverse (12240234), we get a palindrome (55444455).

The spelling of 43204221 in words is "forty-three million, two hundred four thousand, two hundred twenty-one".