243310244021 has 4 divisors (see below), whose sum is σ = 262026416652. Its totient is φ = 224594071392.

The previous prime is 243310243997. The next prime is 243310244033. The reversal of 243310244021 is 120442013342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62744739121 + 180565504900 = 250489^2 + 424930^2 .

It is a cyclic number.

It is not a de Polignac number, because 243310244021 - 2¹⁴ = 243310227637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243310294021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9358086296 + ... + 9358086321.

It is an arithmetic number, because the mean of its divisors is an integer number (65506604163).

Almost surely, 2^243310244021 is an apocalyptic number.

It is an amenable number.

243310244021 is a deficient number, since it is larger than the sum of its proper divisors (18716172631).

243310244021 is a wasteful number, since it uses less digits than its factorization.

243310244021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18716172630.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 243310244021 its reverse (120442013342), we get a palindrome (363752257363).

The spelling of 243310244021 in words is "two hundred forty-three billion, three hundred ten million, two hundred forty-four thousand, twenty-one".