243412240010221 has 2 divisors, whose sum is σ = 243412240010222. Its totient is φ = 243412240010220.

The previous prime is 243412240010179. The next prime is 243412240010243. The reversal of 243412240010221 is 122010042214342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225525726740196 + 17886513270025 = 15017514^2 + 4229245^2 .

It is a cyclic number.

It is not a de Polignac number, because 243412240010221 - 2⁹ = 243412240009709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243412240010221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243412240016221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121706120005110 + 121706120005111.

It is an arithmetic number, because the mean of its divisors is an integer number (121706120005111).

Almost surely, 2^{243412240010221} is an apocalyptic number.

It is an amenable number.

243412240010221 is a deficient number, since it is larger than the sum of its proper divisors (1).

243412240010221 is an equidigital number, since it uses as much as digits as its factorization.

243412240010221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 243412240010221 its reverse (122010042214342), we get a palindrome (365422282224563).

The spelling of 243412240010221 in words is "two hundred forty-three trillion, four hundred twelve billion, two hundred forty million, ten thousand, two hundred twenty-one".