8221209992 has 12 divisors (see below), whose sum is σ = 15415249605. Its totient is φ = 4110476768.

The previous prime is 8221209989. The next prime is 8221210001. The reversal of 8221209992 is 2999021228.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 4477483396 + 3743726596 = 66914^2 + 61186^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=64114.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 240428 + ... + 272484.

Almost surely, 2^8221209992 is an apocalyptic number.

It is an amenable number.

8221209992 is a deficient number, since it is larger than the sum of its proper divisors (7194039613).

8221209992 is an frugal number, since it uses more digits than its factorization.

8221209992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64120 (or 32059 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 8221209992 is about 90670.8883379886. Note that the first 3 decimals coincide. The cubic root of 8221209992 is about 2018.2668197144.

Multiplying 8221209992 by its product of nonzero digits (93312), we get a square (767137546773504 = 27697248²).

The spelling of 8221209992 in words is "eight billion, two hundred twenty-one million, two hundred nine thousand, nine hundred ninety-two".