8221185512891 has 8 divisors (see below), whose sum is σ = 8853775151760. Its totient is φ = 7588623124512.

The previous prime is 8221185512857. The next prime is 8221185512899. The reversal of 8221185512891 is 1982155811228.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8221185512891 - 2¹⁰ = 8221185511867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8221185512899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6183881 + ... + 7394778.

It is an arithmetic number, because the mean of its divisors is an integer number (1106721893970).

Almost surely, 2^{8221185512891} is an apocalyptic number.

8221185512891 is a deficient number, since it is larger than the sum of its proper divisors (632589638869).

8221185512891 is a wasteful number, since it uses less digits than its factorization.

8221185512891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13625245.

The product of its digits is 921600, while the sum is 53.

The spelling of 8221185512891 in words is "eight trillion, two hundred twenty-one billion, one hundred eighty-five million, five hundred twelve thousand, eight hundred ninety-one".