243121252 has 24 divisors (see below), whose sum is σ = 464571072. Its totient is φ = 110407200.

The previous prime is 243121243. The next prime is 243121259. The reversal of 243121252 is 252121342.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (243121259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66102 + ... + 69682.

It is an arithmetic number, because the mean of its divisors is an integer number (19357128).

Almost surely, 2^243121252 is an apocalyptic number.

243121252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

243121252 is a deficient number, since it is larger than the sum of its proper divisors (221449820).

243121252 is a wasteful number, since it uses less digits than its factorization.

243121252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139 (or 5137 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 243121252 is about 15592.3459428016. The cubic root of 243121252 is about 624.1289215598.

Adding to 243121252 its reverse (252121342), we get a palindrome (495242594).

The spelling of 243121252 in words is "two hundred forty-three million, one hundred twenty-one thousand, two hundred fifty-two".