8211481520 has 80 divisors (see below), whose sum is σ = 20847942432. Its totient is φ = 2983034880.

The previous prime is 8211481519. The next prime is 8211481529. The reversal of 8211481520 is 251841128.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (8211481529) 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, 1010594 + ... + 1018686.

Almost surely, 2^8211481520 is an apocalyptic number.

8211481520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8211481520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10423971216).

8211481520 is an abundant number, since it is smaller than the sum of its proper divisors (12636460912).

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

8211481520 is a wasteful number, since it uses less digits than its factorization.

8211481520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9270 (or 9264 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 8211481520 is about 90617.2252940907. The cubic root of 8211481520 is about 2017.4704080682.

The spelling of 8211481520 in words is "eight billion, two hundred eleven million, four hundred eighty-one thousand, five hundred twenty".