12921899 has 4 divisors (see below), whose sum is σ = 12941664. Its totient is φ = 12902136.

The previous prime is 12921893. The next prime is 12921901. The reversal of 12921899 is 99812921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12921899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12921893) 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 3 ways as a sum of consecutive naturals, for example, 8867 + ... + 10220.

It is an arithmetic number, because the mean of its divisors is an integer number (3235416).

Almost surely, 2^12921899 is an apocalyptic number.

12921899 is a deficient number, since it is larger than the sum of its proper divisors (19765).

12921899 is an equidigital number, since it uses as much as digits as its factorization.

12921899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19764.

The product of its digits is 23328, while the sum is 41.

The square root of 12921899 is about 3594.7042993826. The cubic root of 12921899 is about 234.6616467680.

The spelling of 12921899 in words is "twelve million, nine hundred twenty-one thousand, eight hundred ninety-nine".