243121222237 has 2 divisors, whose sum is σ = 243121222238. Its totient is φ = 243121222236.

The previous prime is 243121222177. The next prime is 243121222243. The reversal of 243121222237 is 732222121342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241927243321 + 1193978916 = 491861^2 + 34554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243121222237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243121222199 and 243121222208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121222537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560611118 + 121560611119.

It is an arithmetic number, because the mean of its divisors is an integer number (121560611119).

Almost surely, 2^243121222237 is an apocalyptic number.

It is an amenable number.

243121222237 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121222237 is an equidigital number, since it uses as much as digits as its factorization.

243121222237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 31.

Adding to 243121222237 its reverse (732222121342), we get a palindrome (975343343579).

The spelling of 243121222237 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred thirty-seven".