12121454531540 has 48 divisors (see below), whose sum is σ = 25656757472640. Its totient is φ = 4810212743040.

The previous prime is 12121454531539. The next prime is 12121454531581. The reversal of 12121454531540 is 4513545412121.

It is a junction number, because it is equal to n+sod(n) for n = 12121454531494 and 12121454531503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2260529 + ... + 5417831.

It is an arithmetic number, because the mean of its divisors is an integer number (534515780680).

Almost surely, 2^{12121454531540} is an apocalyptic number.

12121454531540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121454531540 is an abundant number, since it is smaller than the sum of its proper divisors (13535302941100).

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

12121454531540 is a wasteful number, since it uses less digits than its factorization.

12121454531540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158832 (or 3158830 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 38.

Adding to 12121454531540 its reverse (4513545412121), we get a palindrome (16634999943661).

The spelling of 12121454531540 in words is "twelve trillion, one hundred twenty-one billion, four hundred fifty-four million, five hundred thirty-one thousand, five hundred forty".