3984249821091 has 16 divisors (see below), whose sum is σ = 5331580713984. Its totient is φ = 2646550567584.

The previous prime is 3984249821063. The next prime is 3984249821161. The reversal of 3984249821091 is 1901289424893.

It is not a de Polignac number, because 3984249821091 - 2²⁵ = 3984216266659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3984249821011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1060500 + ... + 3015486.

It is an arithmetic number, because the mean of its divisors is an integer number (333223794624).

Almost surely, 2^{3984249821091} is an apocalyptic number.

3984249821091 is a deficient number, since it is larger than the sum of its proper divisors (1347330892893).

3984249821091 is a wasteful number, since it uses less digits than its factorization.

3984249821091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957450.

The product of its (nonzero) digits is 8957952, while the sum is 60.

The spelling of 3984249821091 in words is "three trillion, nine hundred eighty-four billion, two hundred forty-nine million, eight hundred twenty-one thousand, ninety-one".