243221442 has 8 divisors (see below), whose sum is σ = 486442896. Its totient is φ = 81073812.

The previous prime is 243221437. The next prime is 243221449. The reversal of 243221442 is 244122342.

It is a sphenic number, since it is the product of 3 distinct primes.

243221442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (243221449) 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, 20268448 + ... + 20268459.

It is an arithmetic number, because the mean of its divisors is an integer number (60805362).

Almost surely, 2^243221442 is an apocalyptic number.

243221442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243221442 is a wasteful number, since it uses less digits than its factorization.

243221442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40536912.

The product of its digits is 3072, while the sum is 24.

The square root of 243221442 is about 15595.5584061617. The cubic root of 243221442 is about 624.2146440657.

Adding to 243221442 its reverse (244122342), we get a palindrome (487343784).

The spelling of 243221442 in words is "two hundred forty-three million, two hundred twenty-one thousand, four hundred forty-two".