121145321518 has 48 divisors (see below), whose sum is σ = 197886338496. Its totient is φ = 55597301760.

The previous prime is 121145321513. The next prime is 121145321543. The reversal of 121145321518 is 815123541121.

It is a super-3 number, since 3×121145321518³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121145321513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76528155 + ... + 76529737.

It is an arithmetic number, because the mean of its divisors is an integer number (4122632052).

Almost surely, 2^121145321518 is an apocalyptic number.

121145321518 is a deficient number, since it is larger than the sum of its proper divisors (76741016978).

121145321518 is a wasteful number, since it uses less digits than its factorization.

121145321518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2736 counting only the distinct ones).

The product of its digits is 9600, while the sum is 34.

Adding to 121145321518 its reverse (815123541121), we get a palindrome (936268862639).

The spelling of 121145321518 in words is "one hundred twenty-one billion, one hundred forty-five million, three hundred twenty-one thousand, five hundred eighteen".