12049147821 has 4 divisors (see below), whose sum is σ = 16065530432. Its totient is φ = 8032765212.

The previous prime is 12049147807. The next prime is 12049147849. The reversal of 12049147821 is 12874194021.

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 not a de Polignac number, because 12049147821 - 2¹³ = 12049139629 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 12049147821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12049147801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2008191301 + ... + 2008191306.

It is an arithmetic number, because the mean of its divisors is an integer number (4016382608).

Almost surely, 2^12049147821 is an apocalyptic number.

It is an amenable number.

12049147821 is a deficient number, since it is larger than the sum of its proper divisors (4016382611).

12049147821 is an equidigital number, since it uses as much as digits as its factorization.

12049147821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4016382610.

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 12049147821 in words is "twelve billion, forty-nine million, one hundred forty-seven thousand, eight hundred twenty-one".