12919821 has 8 divisors (see below), whose sum is σ = 17248320. Its totient is φ = 8602272.

The previous prime is 12919817. The next prime is 12919843. The reversal of 12919821 is 12891921.

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

It is not a de Polignac number, because 12919821 - 2² = 12919817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12919871) 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, 600 + ... + 5118.

It is an arithmetic number, because the mean of its divisors is an integer number (2156040).

Almost surely, 2^12919821 is an apocalyptic number.

It is an amenable number.

12919821 is a deficient number, since it is larger than the sum of its proper divisors (4328499).

12919821 is an equidigital number, since it uses as much as digits as its factorization.

12919821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475.

The product of its digits is 2592, while the sum is 33.

The square root of 12919821 is about 3594.4152514700. The cubic root of 12919821 is about 234.6490672691.

The spelling of 12919821 in words is "twelve million, nine hundred nineteen thousand, eight hundred twenty-one".