6999321 has 16 divisors (see below), whose sum is σ = 10803200. Its totient is φ = 3948048.

The previous prime is 6999299. The next prime is 6999341. The reversal of 6999321 is 1239996.

It is a happy number.

It is not a de Polignac number, because 6999321 - 2¹⁰ = 6998297 is a prime.

It is a super-2 number, since 2×6999321² = 97980988922082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6999321.

It is not an unprimeable number, because it can be changed into a prime (6999341) 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, 451 + ... + 3768.

It is an arithmetic number, because the mean of its divisors is an integer number (675200).

Almost surely, 2^6999321 is an apocalyptic number.

It is an amenable number.

6999321 is a deficient number, since it is larger than the sum of its proper divisors (3803879).

6999321 is a wasteful number, since it uses less digits than its factorization.

6999321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308.

The product of its digits is 26244, while the sum is 39.

The square root of 6999321 is about 2645.6229890141. The cubic root of 6999321 is about 191.2869329331.

The spelling of 6999321 in words is "six million, nine hundred ninety-nine thousand, three hundred twenty-one".