121105543 has 4 divisors (see below), whose sum is σ = 130421368. Its totient is φ = 111789720.

The previous prime is 121105541. The next prime is 121105547. The reversal of 121105543 is 345501121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121105543 - 2¹ = 121105541 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 (121105541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4657893 + ... + 4657918.

It is an arithmetic number, because the mean of its divisors is an integer number (32605342).

Almost surely, 2^121105543 is an apocalyptic number.

121105543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121105543 is a deficient number, since it is larger than the sum of its proper divisors (9315825).

121105543 is an equidigital number, since it uses as much as digits as its factorization.

121105543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9315824.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 121105543 is about 11004.7963634045. The cubic root of 121105543 is about 494.7525110468.

Adding to 121105543 its reverse (345501121), we get a palindrome (466606664).

The spelling of 121105543 in words is "one hundred twenty-one million, one hundred five thousand, five hundred forty-three".