12121543 has 8 divisors (see below), whose sum is σ = 13910400. Its totient is φ = 10347000.

The previous prime is 12121541. The next prime is 12121547. The reversal of 12121543 is 34512121.

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

It is a cyclic number.

It is not a de Polignac number, because 12121543 - 2¹ = 12121541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121541) 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, 1693 + ... + 5206.

It is an arithmetic number, because the mean of its divisors is an integer number (1738800).

Almost surely, 2^12121543 is an apocalyptic number.

12121543 is a deficient number, since it is larger than the sum of its proper divisors (1788857).

12121543 is an equidigital number, since it uses as much as digits as its factorization.

12121543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7157.

The product of its digits is 240, while the sum is 19.

The square root of 12121543 is about 3481.6006376378. The cubic root of 12121543 is about 229.7132090216.

Adding to 12121543 its reverse (34512121), we get a palindrome (46633664).

The spelling of 12121543 in words is "twelve million, one hundred twenty-one thousand, five hundred forty-three".