12249721 has 8 divisors (see below), whose sum is σ = 13525344. Its totient is φ = 11001120.

The previous prime is 12249719. The next prime is 12249733. The reversal of 12249721 is 12794221.

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 12249721 - 2¹ = 12249719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12249721.

It is not an unprimeable number, because it can be changed into a prime (12249761) 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, 5796 + ... + 7621.

It is an arithmetic number, because the mean of its divisors is an integer number (1690668).

Almost surely, 2^12249721 is an apocalyptic number.

12249721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12249721 is a deficient number, since it is larger than the sum of its proper divisors (1275623).

12249721 is a wasteful number, since it uses less digits than its factorization.

12249721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13511.

The product of its digits is 2016, while the sum is 28.

The square root of 12249721 is about 3499.9601426302. The cubic root of 12249721 is about 230.5200645057.

The spelling of 12249721 in words is "twelve million, two hundred forty-nine thousand, seven hundred twenty-one".