243121355215 has 32 divisors (see below), whose sum is σ = 311605088256. Its totient is φ = 181658695680.

The previous prime is 243121355189. The next prime is 243121355233. The reversal of 243121355215 is 512553121342.

It is a de Polignac number, because none of the positive numbers 2^k-243121355215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23884207 + ... + 23894383.

It is an arithmetic number, because the mean of its divisors is an integer number (9737659008).

Almost surely, 2^243121355215 is an apocalyptic number.

243121355215 is a deficient number, since it is larger than the sum of its proper divisors (68483733041).

243121355215 is a wasteful number, since it uses less digits than its factorization.

243121355215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15079.

The product of its digits is 36000, while the sum is 34.

Adding to 243121355215 its reverse (512553121342), we get a palindrome (755674476557).

The spelling of 243121355215 in words is "two hundred forty-three billion, one hundred twenty-one million, three hundred fifty-five thousand, two hundred fifteen".