999999321 has 8 divisors (see below), whose sum is σ = 1353233184. Its totient is φ = 656715840.

The previous prime is 999999229. The next prime is 999999323. The reversal of 999999321 is 123999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999999321 - 2⁷ = 999999193 is a prime.

It is a super-2 number, since 2×999999321² = 1999997284000922082, which contains 22 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999999323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2487360 + ... + 2487761.

It is an arithmetic number, because the mean of its divisors is an integer number (169154148).

Almost surely, 2^999999321 is an apocalyptic number.

It is an amenable number.

999999321 is a deficient number, since it is larger than the sum of its proper divisors (353233863).

999999321 is a wasteful number, since it uses less digits than its factorization.

999999321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975191.

The product of its digits is 3188646, while the sum is 60.

The square root of 999999321 is about 31622.7658657493. The cubic root of 999999321 is about 999.9997736666. Note that the first 3 decimals are identical.

The spelling of 999999321 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, three hundred twenty-one".