243121241320 has 128 divisors (see below), whose sum is σ = 590713754400. Its totient is φ = 89858764800.

The previous prime is 243121241317. The next prime is 243121241323. The reversal of 243121241320 is 23142121342.

It is an interprime number because it is at equal distance from previous prime (243121241317) and next prime (243121241323).

It can be written as a sum of positive squares in 16 ways, for example, as 350213796 + 242771027524 = 18714^2 + 492718^2 .

It is not an unprimeable number, because it can be changed into a prime (243121241323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2571690 + ... + 2664550.

Almost surely, 2^243121241320 is an apocalyptic number.

243121241320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243121241320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295356877200).

243121241320 is an abundant number, since it is smaller than the sum of its proper divisors (347592513080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243121241320 is a wasteful number, since it uses less digits than its factorization.

243121241320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92999 (or 92995 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 243121241320 its reverse (23142121342), we get a palindrome (266263362662).

The spelling of 243121241320 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-one thousand, three hundred twenty".