921319218 has 32 divisors (see below), whose sum is σ = 2051118720. Its totient is φ = 306545040.

The previous prime is 921319187. The next prime is 921319219. The reversal of 921319218 is 812913129.

It is a super-2 number, since 2×921319218² = 1697658202912263048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (921319219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14763 + ... + 45393.

It is an arithmetic number, because the mean of its divisors is an integer number (64097460).

Almost surely, 2^921319218 is an apocalyptic number.

921319218 is an abundant number, since it is smaller than the sum of its proper divisors (1129799502).

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

921319218 is a wasteful number, since it uses less digits than its factorization.

921319218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31199 (or 31193 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 921319218 is about 30353.2406507114. The cubic root of 921319218 is about 973.0534798065.

The spelling of 921319218 in words is "nine hundred twenty-one million, three hundred nineteen thousand, two hundred eighteen".