99321 has 4 divisors (see below), whose sum is σ = 132432. Its totient is φ = 66212.

The previous prime is 99317. The next prime is 99347. The reversal of 99321 is 12399.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12399 = 3 ⋅4133.

It is a cyclic number.

It is not a de Polignac number, because 99321 - 2² = 99317 is a prime.

It is a super-2 number, since 2×99321² = 19729322082, which contains 22 as substring.

It is a D-number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99291 and 99300.

It is not an unprimeable number, because it can be changed into a prime (99371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16551 + ... + 16556.

It is an arithmetic number, because the mean of its divisors is an integer number (33108).

2⁹⁹³²¹ is an apocalyptic number.

It is an amenable number.

99321 is a deficient number, since it is larger than the sum of its proper divisors (33111).

99321 is a wasteful number, since it uses less digits than its factorization.

99321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33110.

The product of its digits is 486, while the sum is 24.

The square root of 99321 is about 315.1523441131. The cubic root of 99321 is about 46.3105950342.

The spelling of 99321 in words is "ninety-nine thousand, three hundred twenty-one".