8919378221 has 8 divisors (see below), whose sum is σ = 10111036320. Its totient is φ = 7799941872.

The previous prime is 8919378211. The next prime is 8919378227. The reversal of 8919378221 is 1228739198.

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 8919378221 - 2¹⁰ = 8919377197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8919378221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8919378227) 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, 18055175 + ... + 18055668.

It is an arithmetic number, because the mean of its divisors is an integer number (1263879540).

Almost surely, 2^8919378221 is an apocalyptic number.

It is an amenable number.

8919378221 is a deficient number, since it is larger than the sum of its proper divisors (1191658099).

8919378221 is a wasteful number, since it uses less digits than its factorization.

8919378221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36110875.

The product of its digits is 435456, while the sum is 50.

The square root of 8919378221 is about 94442.4598419588. The cubic root of 8919378221 is about 2073.8540705952.

The spelling of 8919378221 in words is "eight billion, nine hundred nineteen million, three hundred seventy-eight thousand, two hundred twenty-one".