243121245331 has 2 divisors, whose sum is σ = 243121245332. Its totient is φ = 243121245330.

The previous prime is 243121245287. The next prime is 243121245347. The reversal of 243121245331 is 133542121342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243121245331 - 2¹⁵ = 243121212563 is a prime.

It is a super-2 number, since 2×243121245331² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243121245293 and 243121245302.

It is not a weakly prime, because it can be changed into another prime (243121240331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560622665 + 121560622666.

It is an arithmetic number, because the mean of its divisors is an integer number (121560622666).

Almost surely, 2^243121245331 is an apocalyptic number.

243121245331 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121245331 is an equidigital number, since it uses as much as digits as its factorization.

243121245331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 31.

Adding to 243121245331 its reverse (133542121342), we get a palindrome (376663366673).

The spelling of 243121245331 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, three hundred thirty-one".