9921345 has 32 divisors (see below), whose sum is σ = 18451200. Its totient is φ = 4458240.

The previous prime is 9921343. The next prime is 9921383. The reversal of 9921345 is 5431299.

It is not a de Polignac number, because 9921345 - 2¹ = 9921343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9921341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5631 + ... + 7179.

It is an arithmetic number, because the mean of its divisors is an integer number (576600).

Almost surely, 2^9921345 is an apocalyptic number.

It is an amenable number.

9921345 is a deficient number, since it is larger than the sum of its proper divisors (8529855).

9921345 is a wasteful number, since it uses less digits than its factorization.

9921345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625.

The product of its digits is 9720, while the sum is 33.

The square root of 9921345 is about 3149.8166613313. The cubic root of 9921345 is about 214.8771246686.

The spelling of 9921345 in words is "nine million, nine hundred twenty-one thousand, three hundred forty-five".