243771421255 has 8 divisors (see below), whose sum is σ = 292530614400. Its totient is φ = 195013864416.

The previous prime is 243771421249. The next prime is 243771421259. The reversal of 243771421255 is 552124177342.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243771421255 - 2¹⁷ = 243771290183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243771421259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53175 + ... + 700264.

It is an arithmetic number, because the mean of its divisors is an integer number (36566326800).

Almost surely, 2^243771421255 is an apocalyptic number.

243771421255 is a deficient number, since it is larger than the sum of its proper divisors (48759193145).

243771421255 is an equidigital number, since it uses as much as digits as its factorization.

243771421255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818153.

The product of its digits is 470400, while the sum is 43.

Adding to 243771421255 its reverse (552124177342), we get a palindrome (795895598597).

The spelling of 243771421255 in words is "two hundred forty-three billion, seven hundred seventy-one million, four hundred twenty-one thousand, two hundred fifty-five".