243200424221 has 2 divisors, whose sum is σ = 243200424222. Its totient is φ = 243200424220.

The previous prime is 243200424199. The next prime is 243200424223. The reversal of 243200424221 is 122424002342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242881408900 + 319015321 = 492830^2 + 17861^2 .

It is a cyclic number.

It is not a de Polignac number, because 243200424221 - 2¹⁰ = 243200423197 is a prime.

Together with 243200424223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243200424223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121600212110 + 121600212111.

It is an arithmetic number, because the mean of its divisors is an integer number (121600212111).

Almost surely, 2^243200424221 is an apocalyptic number.

It is an amenable number.

243200424221 is a deficient number, since it is larger than the sum of its proper divisors (1).

243200424221 is an equidigital number, since it uses as much as digits as its factorization.

243200424221 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 26.

Adding to 243200424221 its reverse (122424002342), we get a palindrome (365624426563).

The spelling of 243200424221 in words is "two hundred forty-three billion, two hundred million, four hundred twenty-four thousand, two hundred twenty-one".