243002221 has 12 divisors (see below), whose sum is σ = 308374560. Its totient is φ = 189351960.

The previous prime is 243002219. The next prime is 243002231. The reversal of 243002221 is 122200342.

It is not a de Polignac number, because 243002221 - 2¹ = 243002219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243002195 and 243002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243002231) 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, 224881 + ... + 225958.

It is an arithmetic number, because the mean of its divisors is an integer number (25697880).

Almost surely, 2^243002221 is an apocalyptic number.

It is an amenable number.

243002221 is a deficient number, since it is larger than the sum of its proper divisors (65372339).

243002221 is a wasteful number, since it uses less digits than its factorization.

243002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450864 (or 450857 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 243002221 is about 15588.5285065653. The cubic root of 243002221 is about 624.0270480893.

Adding to 243002221 its reverse (122200342), we get a palindrome (365202563).

The spelling of 243002221 in words is "two hundred forty-three million, two thousand, two hundred twenty-one".