9821216 has 12 divisors (see below), whose sum is σ = 19335582. Its totient is φ = 4910592.

The previous prime is 9821213. The next prime is 9821219. The reversal of 9821216 is 6121289.

It is an interprime number because it is at equal distance from previous prime (9821213) and next prime (9821219).

It can be written as a sum of positive squares in only one way, i.e., 5740816 + 4080400 = 2396^2 + 2020^2 .

It is not an unprimeable number, because it can be changed into a prime (9821213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153425 + ... + 153488.

Almost surely, 2^9821216 is an apocalyptic number.

It is an amenable number.

9821216 is a deficient number, since it is larger than the sum of its proper divisors (9514366).

9821216 is a wasteful number, since it uses less digits than its factorization.

9821216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306923 (or 306915 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 9821216 is about 3133.8819377890. The cubic root of 9821216 is about 214.1518123877.

The spelling of 9821216 in words is "nine million, eight hundred twenty-one thousand, two hundred sixteen".