3921803121 has 16 divisors (see below), whose sum is σ = 5251400000. Its totient is φ = 2603389248.

The previous prime is 3921803111. The next prime is 3921803131. The reversal of 3921803121 is 1213081293.

It is an interprime number because it is at equal distance from previous prime (3921803111) and next prime (3921803131).

It is not a de Polignac number, because 3921803121 - 2⁶ = 3921803057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3921803111) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1425255 + ... + 1428003.

It is an arithmetic number, because the mean of its divisors is an integer number (328212500).

Almost surely, 2^3921803121 is an apocalyptic number.

It is an amenable number.

3921803121 is a deficient number, since it is larger than the sum of its proper divisors (1329596879).

3921803121 is a wasteful number, since it uses less digits than its factorization.

3921803121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 3921803121 is about 62624.3013613725. The cubic root of 3921803121 is about 1576.9887528489.

The spelling of 3921803121 in words is "three billion, nine hundred twenty-one million, eight hundred three thousand, one hundred twenty-one".