9972321 has 16 divisors (see below), whose sum is σ = 14264640. Its totient is φ = 6177600.

The previous prime is 9972241. The next prime is 9972329. The reversal of 9972321 is 1232799.

It is not a de Polignac number, because 9972321 - 2¹¹ = 9970273 is a prime.

It is a super-2 number, since 2×9972321² = 198894372254082, which contains 22 as substring.

9972321 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9972329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1371 + ... + 4671.

It is an arithmetic number, because the mean of its divisors is an integer number (891540).

Almost surely, 2^9972321 is an apocalyptic number.

It is an amenable number.

9972321 is a deficient number, since it is larger than the sum of its proper divisors (4292319).

9972321 is a wasteful number, since it uses less digits than its factorization.

9972321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3376.

The product of its digits is 6804, while the sum is 33.

The square root of 9972321 is about 3157.8981934192. The cubic root of 9972321 is about 215.2445099980.

The spelling of 9972321 in words is "nine million, nine hundred seventy-two thousand, three hundred twenty-one".