243211342321 has 2 divisors, whose sum is σ = 243211342322. Its totient is φ = 243211342320.

The previous prime is 243211342307. The next prime is 243211342331. The reversal of 243211342321 is 123243112342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199724079025 + 43487263296 = 446905^2 + 208536^2 .

It is a cyclic number.

It is not a de Polignac number, because 243211342321 - 2¹⁷ = 243211211249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243211342321.

It is not a weakly prime, because it can be changed into another prime (243211342331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121605671160 + 121605671161.

It is an arithmetic number, because the mean of its divisors is an integer number (121605671161).

Almost surely, 2^243211342321 is an apocalyptic number.

It is an amenable number.

243211342321 is a deficient number, since it is larger than the sum of its proper divisors (1).

243211342321 is an equidigital number, since it uses as much as digits as its factorization.

243211342321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

Adding to 243211342321 its reverse (123243112342), we get a palindrome (366454454663).

The spelling of 243211342321 in words is "two hundred forty-three billion, two hundred eleven million, three hundred forty-two thousand, three hundred twenty-one".