3972821911911 has 32 divisors (see below), whose sum is σ = 6266307902400. Its totient is φ = 2478978846720.

The previous prime is 3972821911901. The next prime is 3972821911939. The reversal of 3972821911911 is 1191191282793.

3972821911911 is a `hidden beast` number, since 3 + 97 + 282 + 1 + 91 + 191 + 1 = 666.

It is not a de Polignac number, because 3972821911911 - 2¹⁷ = 3972821780839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3972821911901) 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, 23826826 + ... + 23992983.

It is an arithmetic number, because the mean of its divisors is an integer number (195822121950).

Almost surely, 2^{3972821911911} is an apocalyptic number.

3972821911911 is a deficient number, since it is larger than the sum of its proper divisors (2293485990489).

3972821911911 is a wasteful number, since it uses less digits than its factorization.

3972821911911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47820016 (or 47820010 counting only the distinct ones).

The product of its digits is 489888, while the sum is 54.

The spelling of 3972821911911 in words is "three trillion, nine hundred seventy-two billion, eight hundred twenty-one million, nine hundred eleven thousand, nine hundred eleven".