12812821 has 8 divisors (see below), whose sum is σ = 15414080. Its totient is φ = 10404288.

The previous prime is 12812819. The next prime is 12812831. The reversal of 12812821 is 12821821.

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 12812821 - 2¹ = 12812819 is a prime.

It is the 3580-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12812801) by changing a digit.

It is a nontrivial repunit in base 3579.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48036 + ... + 48301.

It is an arithmetic number, because the mean of its divisors is an integer number (1926760).

Almost surely, 2^12812821 is an apocalyptic number.

It is an amenable number.

12812821 is a deficient number, since it is larger than the sum of its proper divisors (2601259).

12812821 is an equidigital number, since it uses as much as digits as its factorization.

12812821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96363.

The product of its digits is 512, while the sum is 25.

The square root of 12812821 is about 3579.5001047632. The cubic root of 12812821 is about 233.9994947270. Note that the first 3 decimals are identical.

The spelling of 12812821 in words is "twelve million, eight hundred twelve thousand, eight hundred twenty-one".