12321999895 has 4 divisors (see below), whose sum is σ = 14786399880. Its totient is φ = 9857599912.

The previous prime is 12321999889. The next prime is 12321999923. The reversal of 12321999895 is 59899912321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59899912321 = 577 ⋅103812673.

It is a cyclic number.

It is not a de Polignac number, because 12321999895 - 2¹¹ = 12321997847 is a prime.

It is a super-2 number, since 2×12321999895² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1232199985 + ... + 1232199994.

It is an arithmetic number, because the mean of its divisors is an integer number (3696599970).

Almost surely, 2^12321999895 is an apocalyptic number.

12321999895 is a deficient number, since it is larger than the sum of its proper divisors (2464399985).

12321999895 is an equidigital number, since it uses as much as digits as its factorization.

12321999895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464399984.

The product of its digits is 3149280, while the sum is 58.

The spelling of 12321999895 in words is "twelve billion, three hundred twenty-one million, nine hundred ninety-nine thousand, eight hundred ninety-five".