12347021 has 8 divisors (see below), whose sum is σ = 13300224. Its totient is φ = 11428560.

The previous prime is 12347009. The next prime is 12347029. The reversal of 12347021 is 12074321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12347021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12346984 and 12347002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12347029) 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 7 ways as a sum of consecutive naturals, for example, 7946 + ... + 9371.

It is an arithmetic number, because the mean of its divisors is an integer number (1662528).

Almost surely, 2^12347021 is an apocalyptic number.

It is an amenable number.

12347021 is a deficient number, since it is larger than the sum of its proper divisors (953203).

12347021 is a wasteful number, since it uses less digits than its factorization.

12347021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17371.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 12347021 is about 3513.8328076333. The cubic root of 12347021 is about 231.1287988206.

The spelling of 12347021 in words is "twelve million, three hundred forty-seven thousand, twenty-one".