243121243357 has 2 divisors, whose sum is σ = 243121243358. Its totient is φ = 243121243356.

The previous prime is 243121243331. The next prime is 243121243361. The reversal of 243121243357 is 753342121342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241999060356 + 1122183001 = 491934^2 + 33499^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121243357 - 2⁷ = 243121243229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121243367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560621678 + 121560621679.

It is an arithmetic number, because the mean of its divisors is an integer number (121560621679).

Almost surely, 2^243121243357 is an apocalyptic number.

It is an amenable number.

243121243357 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121243357 is an equidigital number, since it uses as much as digits as its factorization.

243121243357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 37.

Adding to 243121243357 its reverse (753342121342), we get a palindrome (996463364699).

The spelling of 243121243357 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-three thousand, three hundred fifty-seven".