12166521 has 8 divisors (see below), whose sum is σ = 16528320. Its totient is φ = 7957872.

The previous prime is 12166513. The next prime is 12166529. The reversal of 12166521 is 12566121.

It is an interprime number because it is at equal distance from previous prime (12166513) and next prime (12166529).

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

It is not a de Polignac number, because 12166521 - 2³ = 12166513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12166491 and 12166500.

It is not an unprimeable number, because it can be changed into a prime (12166529) 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, 38101 + ... + 38418.

It is an arithmetic number, because the mean of its divisors is an integer number (2066040).

Almost surely, 2^12166521 is an apocalyptic number.

It is an amenable number.

12166521 is a deficient number, since it is larger than the sum of its proper divisors (4361799).

12166521 is an equidigital number, since it uses as much as digits as its factorization.

12166521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76575.

The product of its digits is 720, while the sum is 24.

The square root of 12166521 is about 3488.0540420125. The cubic root of 12166521 is about 229.9969816869.

The spelling of 12166521 in words is "twelve million, one hundred sixty-six thousand, five hundred twenty-one".