43240221 has 12 divisors (see below), whose sum is σ = 63077820. Its totient is φ = 28540800.

The previous prime is 43240213. The next prime is 43240229. The reversal of 43240221 is 12204234.

It is an interprime number because it is at equal distance from previous prime (43240213) and next prime (43240229).

It can be written as a sum of positive squares in 2 ways, for example, as 32936121 + 10304100 = 5739^2 + 3210^2 .

It is not a de Polignac number, because 43240221 - 2³ = 43240213 is a prime.

It is a super-3 number, since 3×43240221³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43240194 and 43240203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43240229) 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, 22876 + ... + 24693.

It is an arithmetic number, because the mean of its divisors is an integer number (5256485).

Almost surely, 2^43240221 is an apocalyptic number.

It is an amenable number.

43240221 is a deficient number, since it is larger than the sum of its proper divisors (19837599).

43240221 is a wasteful number, since it uses less digits than its factorization.

43240221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47676 (or 47673 counting only the distinct ones).

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

The square root of 43240221 is about 6575.7296933496. The cubic root of 43240221 is about 350.9909901016.

Adding to 43240221 its reverse (12204234), we get a palindrome (55444455).

The spelling of 43240221 in words is "forty-three million, two hundred forty thousand, two hundred twenty-one".