12142345821 has 8 divisors (see below), whose sum is σ = 16194477984. Its totient is φ = 8092555440.

The previous prime is 12142345811. The next prime is 12142345823. The reversal of 12142345821 is 12854324121.

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

It is not a de Polignac number, because 12142345821 - 2²¹ = 12140248669 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12142345823) 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 7 ways as a sum of consecutive naturals, for example, 573310 + ... + 594111.

It is an arithmetic number, because the mean of its divisors is an integer number (2024309748).

Almost surely, 2^12142345821 is an apocalyptic number.

It is an amenable number.

12142345821 is a deficient number, since it is larger than the sum of its proper divisors (4052132163).

12142345821 is a wasteful number, since it uses less digits than its factorization.

12142345821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170891.

The product of its digits is 15360, while the sum is 33.

Adding to 12142345821 its reverse (12854324121), we get a palindrome (24996669942).

The spelling of 12142345821 in words is "twelve billion, one hundred forty-two million, three hundred forty-five thousand, eight hundred twenty-one".