8221512492 has 36 divisors (see below), whose sum is σ = 20789725320. Its totient is φ = 2739506112.

The previous prime is 8221512421. The next prime is 8221512493. The reversal of 8221512492 is 2942151228.

8221512492 is a `hidden beast` number, since 82 + 21 + 512 + 49 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×8221512492² (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 (8221512493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62184 + ... + 142512.

It is an arithmetic number, because the mean of its divisors is an integer number (577492370).

Almost surely, 2^8221512492 is an apocalyptic number.

It is an amenable number.

8221512492 is an abundant number, since it is smaller than the sum of its proper divisors (12568212828).

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

8221512492 is a wasteful number, since it uses less digits than its factorization.

8221512492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83182 (or 83177 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 8221512492 is about 90672.5564435017. The cubic root of 8221512492 is about 2018.2915735007.

The spelling of 8221512492 in words is "eight billion, two hundred twenty-one million, five hundred twelve thousand, four hundred ninety-two".