243121522155 has 16 divisors (see below), whose sum is σ = 389009909760. Its totient is φ = 129659653728.

The previous prime is 243121522129. The next prime is 243121522177. The reversal of 243121522155 is 551225121342.

243121522155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243121522155 - 2¹¹ = 243121520107 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83766 + ... + 702324.

It is an arithmetic number, because the mean of its divisors is an integer number (24313119360).

Almost surely, 2^243121522155 is an apocalyptic number.

243121522155 is a deficient number, since it is larger than the sum of its proper divisors (145888387605).

243121522155 is a wasteful number, since it uses less digits than its factorization.

243121522155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644770.

The product of its digits is 24000, while the sum is 33.

Adding to 243121522155 its reverse (551225121342), we get a palindrome (794346643497).

The spelling of 243121522155 in words is "two hundred forty-three billion, one hundred twenty-one million, five hundred twenty-two thousand, one hundred fifty-five".