3816933801921 has 24 divisors (see below), whose sum is σ = 5539287032136. Its totient is φ = 2532660034560.

The previous prime is 3816933801917. The next prime is 3816933801943. The reversal of 3816933801921 is 1291083396183.

It can be written as a sum of positive squares in 4 ways, for example, as 153537801921 + 3663396000000 = 391839^2 + 1914000^2 .

It is not a de Polignac number, because 3816933801921 - 2² = 3816933801917 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (3816933801911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4745941 + ... + 5491613.

It is an arithmetic number, because the mean of its divisors is an integer number (230803626339).

Almost surely, 2^{3816933801921} is an apocalyptic number.

It is an amenable number.

3816933801921 is a deficient number, since it is larger than the sum of its proper divisors (1722353230215).

3816933801921 is a wasteful number, since it uses less digits than its factorization.

3816933801921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748353 (or 748350 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 3816933801921 in words is "three trillion, eight hundred sixteen billion, nine hundred thirty-three million, eight hundred one thousand, nine hundred twenty-one".