12921791 has 8 divisors (see below), whose sum is σ = 13949280. Its totient is φ = 11933152.

The previous prime is 12921763. The next prime is 12921809. The reversal of 12921791 is 19712921.

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

It is not a de Polignac number, because 12921791 - 2¹⁰ = 12920767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12921091) 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, 9020 + ... + 10353.

It is an arithmetic number, because the mean of its divisors is an integer number (1743660).

Almost surely, 2^12921791 is an apocalyptic number.

12921791 is a deficient number, since it is larger than the sum of its proper divisors (1027489).

12921791 is a wasteful number, since it uses less digits than its factorization.

12921791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19425.

The product of its digits is 2268, while the sum is 32.

The square root of 12921791 is about 3594.6892772533. The cubic root of 12921791 is about 234.6609930063.

The spelling of 12921791 in words is "twelve million, nine hundred twenty-one thousand, seven hundred ninety-one".