12320821 has 8 divisors (see below), whose sum is σ = 12519360. Its totient is φ = 12124128.

The previous prime is 12320783. The next prime is 12320827. The reversal of 12320821 is 12802321.

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

It is a cyclic number.

It is not a de Polignac number, because 12320821 - 2⁹ = 12320309 is a prime.

It is a super-2 number, since 2×12320821² = 303605260228082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320827) 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, 18720 + ... + 19366.

It is an arithmetic number, because the mean of its divisors is an integer number (1564920).

Almost surely, 2^12320821 is an apocalyptic number.

It is an amenable number.

12320821 is a deficient number, since it is larger than the sum of its proper divisors (198539).

12320821 is a wasteful number, since it uses less digits than its factorization.

12320821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 12320821 is about 3510.1027050501. The cubic root of 12320821 is about 230.9652003074.

The spelling of 12320821 in words is "twelve million, three hundred twenty thousand, eight hundred twenty-one".