243121522113 has 48 divisors (see below), whose sum is σ = 375139331840. Its totient is φ = 157230533376.

The previous prime is 243121522087. The next prime is 243121522129. The reversal of 243121522113 is 311225121342.

It is a happy number.

243121522113 is a `hidden beast` number, since 2 + 4 + 3 + 1 + 21 + 522 + 113 = 666.

It is not a de Polignac number, because 243121522113 - 2¹⁴ = 243121505729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243121522183) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2989848 + ... + 3070086.

Almost surely, 2^243121522113 is an apocalyptic number.

It is an amenable number.

243121522113 is a deficient number, since it is larger than the sum of its proper divisors (132017809727).

243121522113 is an equidigital number, since it uses as much as digits as its factorization.

243121522113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80628 (or 80616 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

Adding to 243121522113 its reverse (311225121342), we get a palindrome (554346643455).

The spelling of 243121522113 in words is "two hundred forty-three billion, one hundred twenty-one million, five hundred twenty-two thousand, one hundred thirteen".