12143551052521 has 4 divisors (see below), whose sum is σ = 13878344060032. Its totient is φ = 10408758045012.

The previous prime is 12143551052497. The next prime is 12143551052539. The reversal of 12143551052521 is 12525015534121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12143551052521 - 2¹¹ = 12143551050473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12143551052921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 867396503745 + ... + 867396503758.

It is an arithmetic number, because the mean of its divisors is an integer number (3469586015008).

Almost surely, 2^{12143551052521} is an apocalyptic number.

It is an amenable number.

12143551052521 is a deficient number, since it is larger than the sum of its proper divisors (1734793007511).

12143551052521 is an equidigital number, since it uses as much as digits as its factorization.

12143551052521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734793007510.

The product of its (nonzero) digits is 60000, while the sum is 37.

Adding to 12143551052521 its reverse (12525015534121), we get a palindrome (24668566586642).

The spelling of 12143551052521 in words is "twelve trillion, one hundred forty-three billion, five hundred fifty-one million, fifty-two thousand, five hundred twenty-one".