3971821861088 has 48 divisors (see below), whose sum is σ = 8342698717584. Its totient is φ = 1854824724480.

The previous prime is 3971821861087. The next prime is 3971821861099. The reversal of 3971821861088 is 8801681281793.

3971821861088 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 3971821861088.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971821861081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27795695 + ... + 27938222.

It is an arithmetic number, because the mean of its divisors is an integer number (173806223283).

Almost surely, 2^{3971821861088} is an apocalyptic number.

It is an amenable number.

3971821861088 is an abundant number, since it is smaller than the sum of its proper divisors (4370876856496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3971821861088 is a wasteful number, since it uses less digits than its factorization.

3971821861088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55734075 (or 55734067 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 62.

The spelling of 3971821861088 in words is "three trillion, nine hundred seventy-one billion, eight hundred twenty-one million, eight hundred sixty-one thousand, eighty-eight".