3821721969849 has 32 divisors (see below), whose sum is σ = 6490673326080. Its totient is φ = 1947201990912.

The previous prime is 3821721969841. The next prime is 3821721969907. The reversal of 3821721969849 is 9489691271283.

3821721969849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3821721969849 - 2³ = 3821721969841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3821721969841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281706469 + ... + 281720034.

It is an arithmetic number, because the mean of its divisors is an integer number (202833541440).

Almost surely, 2^{3821721969849} is an apocalyptic number.

It is an amenable number.

3821721969849 is a deficient number, since it is larger than the sum of its proper divisors (2668951356231).

3821721969849 is a wasteful number, since it uses less digits than its factorization.

3821721969849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563426549.

The product of its digits is 94058496, while the sum is 69.

The spelling of 3821721969849 in words is "three trillion, eight hundred twenty-one billion, seven hundred twenty-one million, nine hundred sixty-nine thousand, eight hundred forty-nine".