243221052515 has 16 divisors (see below), whose sum is σ = 334352625600. Its totient is φ = 166383987840.

The previous prime is 243221052511. The next prime is 243221052619. The reversal of 243221052515 is 515250122342.

It is not a de Polignac number, because 243221052515 - 2² = 243221052511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243221052511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8238440 + ... + 8267909.

It is an arithmetic number, because the mean of its divisors is an integer number (20897039100).

Almost surely, 2^243221052515 is an apocalyptic number.

243221052515 is a deficient number, since it is larger than the sum of its proper divisors (91131573085).

243221052515 is a wasteful number, since it uses less digits than its factorization.

243221052515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16506782.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 243221052515 its reverse (515250122342), we get a palindrome (758471174857).

The spelling of 243221052515 in words is "two hundred forty-three billion, two hundred twenty-one million, fifty-two thousand, five hundred fifteen".