12905121 has 4 divisors (see below), whose sum is σ = 17206832. Its totient is φ = 8603412.

The previous prime is 12905111. The next prime is 12905131. The reversal of 12905121 is 12150921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (12905111) and next prime (12905131).

It is not a de Polignac number, because 12905121 - 2⁷ = 12904993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12905111) 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, 2150851 + ... + 2150856.

It is an arithmetic number, because the mean of its divisors is an integer number (4301708).

Almost surely, 2^12905121 is an apocalyptic number.

It is an amenable number.

12905121 is a deficient number, since it is larger than the sum of its proper divisors (4301711).

12905121 is an equidigital number, since it uses as much as digits as its factorization.

12905121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4301710.

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

The square root of 12905121 is about 3592.3698306271. The cubic root of 12905121 is about 234.5600399696.

The spelling of 12905121 in words is "twelve million, nine hundred five thousand, one hundred twenty-one".