8151821712 has 120 divisors (see below), whose sum is σ = 24045365760. Its totient is φ = 2570952960.

The previous prime is 8151821687. The next prime is 8151821719. The reversal of 8151821712 is 2171281518.

It is a super-2 number, since 2×8151821712² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (8151821719) 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, 2972662 + ... + 2975402.

It is an arithmetic number, because the mean of its divisors is an integer number (200378048).

Almost surely, 2^8151821712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8151821712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12022682880).

8151821712 is an abundant number, since it is smaller than the sum of its proper divisors (15893544048).

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

8151821712 is a wasteful number, since it uses less digits than its factorization.

8151821712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861 (or 3852 counting only the distinct ones).

The product of its digits is 8960, while the sum is 36.

The square root of 8151821712 is about 90287.4393921990. The cubic root of 8151821712 is about 2012.5726084782.

The spelling of 8151821712 in words is "eight billion, one hundred fifty-one million, eight hundred twenty-one thousand, seven hundred twelve".