8647949195221 has 4 divisors (see below), whose sum is σ = 9883370508832. Its totient is φ = 7412527881612.

The previous prime is 8647949195183. The next prime is 8647949195267. The reversal of 8647949195221 is 1225919497468.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8647949195221 - 2¹¹ = 8647949193173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8647940195221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617710656795 + ... + 617710656808.

It is an arithmetic number, because the mean of its divisors is an integer number (2470842627208).

Almost surely, 2^{8647949195221} is an apocalyptic number.

It is an amenable number.

8647949195221 is a deficient number, since it is larger than the sum of its proper divisors (1235421313611).

8647949195221 is a wasteful number, since it uses less digits than its factorization.

8647949195221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235421313610.

The product of its digits is 78382080, while the sum is 67.

The spelling of 8647949195221 in words is "eight trillion, six hundred forty-seven billion, nine hundred forty-nine million, one hundred ninety-five thousand, two hundred twenty-one".