9912321 has 8 divisors (see below), whose sum is σ = 14684960. Its totient is φ = 6608196.

The previous prime is 9912313. The next prime is 9912391. The reversal of 9912321 is 1232199.

It is not a de Polignac number, because 9912321 - 2³ = 9912313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 367123 = 9912321 / (9 + 9 + 1 + 2 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9912311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183535 + ... + 183588.

It is an arithmetic number, because the mean of its divisors is an integer number (1835620).

It is a Proth number, since it is equal to 605 ⋅ 2¹⁴ + 1 and 605 < 2¹⁴.

Almost surely, 2^9912321 is an apocalyptic number.

It is an amenable number.

9912321 is a deficient number, since it is larger than the sum of its proper divisors (4772639).

9912321 is a wasteful number, since it uses less digits than its factorization.

9912321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367132 (or 367126 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 9912321 is about 3148.3838711313. The cubic root of 9912321 is about 214.8119574505.

The spelling of 9912321 in words is "nine million, nine hundred twelve thousand, three hundred twenty-one".