12921105 has 16 divisors (see below), whose sum is σ = 21890304. Its totient is φ = 6485760.

The previous prime is 12921091. The next prime is 12921119. The reversal of 12921105 is 50112921.

12921105 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12921091) and next prime (12921119).

It is not a de Polignac number, because 12921105 - 2⁴ = 12921089 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25081 + ... + 25590.

It is an arithmetic number, because the mean of its divisors is an integer number (1368144).

Almost surely, 2^12921105 is an apocalyptic number.

12921105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12921105 is a deficient number, since it is larger than the sum of its proper divisors (8969199).

12921105 is a wasteful number, since it uses less digits than its factorization.

12921105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50696.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 12921105 is about 3594.5938574476. The cubic root of 12921105 is about 234.6568403237.

The spelling of 12921105 in words is "twelve million, nine hundred twenty-one thousand, one hundred five".