12988821 has 8 divisors (see below), whose sum is σ = 17577184. Its totient is φ = 8529840.

The previous prime is 12988819. The next prime is 12988831. The reversal of 12988821 is 12888921.

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

It is not a de Polignac number, because 12988821 - 2¹ = 12988819 is a prime.

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 12988821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12988831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32110 + ... + 32511.

It is an arithmetic number, because the mean of its divisors is an integer number (2197148).

Almost surely, 2^12988821 is an apocalyptic number.

It is an amenable number.

12988821 is a deficient number, since it is larger than the sum of its proper divisors (4588363).

12988821 is an equidigital number, since it uses as much as digits as its factorization.

12988821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64691.

The product of its digits is 18432, while the sum is 39.

The square root of 12988821 is about 3604.0006936736. Note that the first 3 decimals coincide. The cubic root of 12988821 is about 235.0660505449.

The spelling of 12988821 in words is "twelve million, nine hundred eighty-eight thousand, eight hundred twenty-one".