12095821 has 4 divisors (see below), whose sum is σ = 12103200. Its totient is φ = 12088444.

The previous prime is 12095807. The next prime is 12095843. The reversal of 12095821 is 12859021.

12095821 is a nontrivial binomial coefficient, being equal to C(4919, 2).

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, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12095821 - 2⁷ = 12095693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12095821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12095801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 4918.

It is an arithmetic number, because the mean of its divisors is an integer number (3025800).

Almost surely, 2^12095821 is an apocalyptic number.

12095821 is the 4918-th triangular number.

12095821 is the 1640-th centered nonagonal number.

It is an amenable number.

12095821 is a deficient number, since it is larger than the sum of its proper divisors (7379).

12095821 is an equidigital number, since it uses as much as digits as its factorization.

12095821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7378.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 12095821 is about 3477.9046852954. The cubic root of 12095821 is about 229.5506096034.

The spelling of 12095821 in words is "twelve million, ninety-five thousand, eight hundred twenty-one".