243001011303221 has 2 divisors, whose sum is σ = 243001011303222. Its totient is φ = 243001011303220.

The previous prime is 243001011303191. The next prime is 243001011303233. The reversal of 243001011303221 is 122303110100342.

243001011303221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240172072320196 + 2828938983025 = 15497486^2 + 1681945^2 .

It is a cyclic number.

It is not a de Polignac number, because 243001011303221 - 2¹⁰ = 243001011302197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243001011303241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121500505651610 + 121500505651611.

It is an arithmetic number, because the mean of its divisors is an integer number (121500505651611).

Almost surely, 2^{243001011303221} is an apocalyptic number.

It is an amenable number.

243001011303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

243001011303221 is an equidigital number, since it uses as much as digits as its factorization.

243001011303221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 243001011303221 its reverse (122303110100342), we get a palindrome (365304121403563).

The spelling of 243001011303221 in words is "two hundred forty-three trillion, one billion, eleven million, three hundred three thousand, two hundred twenty-one".