12121566 has 8 divisors (see below), whose sum is σ = 24243144. Its totient is φ = 4040520.

The previous prime is 12121547. The next prime is 12121579. The reversal of 12121566 is 66512121.

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

12121566 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010125 + ... + 1010136.

It is an arithmetic number, because the mean of its divisors is an integer number (3030393).

Almost surely, 2^12121566 is an apocalyptic number.

12121566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12121566 is a wasteful number, since it uses less digits than its factorization.

12121566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020266.

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

The square root of 12121566 is about 3481.6039407147. The cubic root of 12121566 is about 229.7133543112.

Adding to 12121566 its reverse (66512121), we get a palindrome (78633687).

The spelling of 12121566 in words is "twelve million, one hundred twenty-one thousand, five hundred sixty-six".