12921249 has 8 divisors (see below), whose sum is σ = 18794592. Its totient is φ = 7831040.

The previous prime is 12921217. The next prime is 12921263. The reversal of 12921249 is 94212921.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12921249 - 2⁵ = 12921217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12921299) 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, 195744 + ... + 195809.

It is an arithmetic number, because the mean of its divisors is an integer number (2349324).

Almost surely, 2^12921249 is an apocalyptic number.

It is an amenable number.

12921249 is a deficient number, since it is larger than the sum of its proper divisors (5873343).

12921249 is a wasteful number, since it uses less digits than its factorization.

12921249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391567.

The product of its digits is 2592, while the sum is 30.

The square root of 12921249 is about 3594.6138874711. The cubic root of 12921249 is about 234.6577120360.

The spelling of 12921249 in words is "twelve million, nine hundred twenty-one thousand, two hundred forty-nine".