243250221 has 4 divisors (see below), whose sum is σ = 324333632. Its totient is φ = 162166812.

The previous prime is 243250201. The next prime is 243250223. The reversal of 243250221 is 122052342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 243250221 - 2⁶ = 243250157 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 (243250223) 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, 40541701 + ... + 40541706.

It is an arithmetic number, because the mean of its divisors is an integer number (81083408).

Almost surely, 2^243250221 is an apocalyptic number.

It is an amenable number.

243250221 is a deficient number, since it is larger than the sum of its proper divisors (81083411).

243250221 is an equidigital number, since it uses as much as digits as its factorization.

243250221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81083410.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 243250221 is about 15596.4810454153. The cubic root of 243250221 is about 624.2392630091.

The spelling of 243250221 in words is "two hundred forty-three million, two hundred fifty thousand, two hundred twenty-one".