12302721 has 12 divisors (see below), whose sum is σ = 17935060. Its totient is φ = 8125920.

The previous prime is 12302711. The next prime is 12302729. The reversal of 12302721 is 12720321.

It can be written as a sum of positive squares in 2 ways, for example, as 9678321 + 2624400 = 3111^2 + 1620^2 .

It is not a de Polignac number, because 12302721 - 2⁶ = 12302657 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 12302694 and 12302703.

It is not an unprimeable number, because it can be changed into a prime (12302729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5290 + ... + 7251.

Almost surely, 2^12302721 is an apocalyptic number.

It is an amenable number.

12302721 is a deficient number, since it is larger than the sum of its proper divisors (5632339).

12302721 is a wasteful number, since it uses less digits than its factorization.

12302721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12656 (or 12653 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 12302721 is about 3507.5234853098. The cubic root of 12302721 is about 230.8520444575.

The spelling of 12302721 in words is "twelve million, three hundred two thousand, seven hundred twenty-one".