243393957121 has 4 divisors (see below), whose sum is σ = 278164522432. Its totient is φ = 208623391812.

The previous prime is 243393957119. The next prime is 243393957127. The reversal of 243393957121 is 121759393342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243393957121 - 2¹ = 243393957119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243393957127) 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, 17385282645 + ... + 17385282658.

It is an arithmetic number, because the mean of its divisors is an integer number (69541130608).

Almost surely, 2^243393957121 is an apocalyptic number.

It is an amenable number.

243393957121 is a deficient number, since it is larger than the sum of its proper divisors (34770565311).

243393957121 is an equidigital number, since it uses as much as digits as its factorization.

243393957121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34770565310.

The product of its digits is 1224720, while the sum is 49.

The spelling of 243393957121 in words is "two hundred forty-three billion, three hundred ninety-three million, nine hundred fifty-seven thousand, one hundred twenty-one".