243212122 has 16 divisors (see below), whose sum is σ = 392192640. Its totient is φ = 112753728.

The previous prime is 243212117. The next prime is 243212159. The reversal of 243212122 is 221212342.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 243212122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66303 + ... + 69874.

It is an arithmetic number, because the mean of its divisors is an integer number (24512040).

Almost surely, 2^243212122 is an apocalyptic number.

243212122 is a deficient number, since it is larger than the sum of its proper divisors (148980518).

243212122 is a wasteful number, since it uses less digits than its factorization.

243212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136245.

The product of its digits is 384, while the sum is 19.

The square root of 243212122 is about 15595.2596002760. The cubic root of 243212122 is about 624.2066708723.

Adding to 243212122 its reverse (221212342), we get a palindrome (464424464).

The spelling of 243212122 in words is "two hundred forty-three million, two hundred twelve thousand, one hundred twenty-two".