12121554105543 has 8 divisors (see below), whose sum is σ = 16162176736768. Its totient is φ = 8080983772344.

The previous prime is 12121554105533. The next prime is 12121554105649. The reversal of 12121554105543 is 34550145512121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12121554105543 - 2¹⁶ = 12121554040007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121554105523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12530455 + ... + 13463112.

It is an arithmetic number, because the mean of its divisors is an integer number (2020272092096).

Almost surely, 2^{12121554105543} is an apocalyptic number.

12121554105543 is a deficient number, since it is larger than the sum of its proper divisors (4040622631225).

12121554105543 is a wasteful number, since it uses less digits than its factorization.

12121554105543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26149013.

The product of its (nonzero) digits is 120000, while the sum is 39.

Adding to 12121554105543 its reverse (34550145512121), we get a palindrome (46671699617664).

The spelling of 12121554105543 in words is "twelve trillion, one hundred twenty-one billion, five hundred fifty-four million, one hundred five thousand, five hundred forty-three".