12218571 has 6 divisors (see below), whose sum is σ = 17649060. Its totient is φ = 8145708.

The previous prime is 12218537. The next prime is 12218587. The reversal of 12218571 is 17581221.

It is not a de Polignac number, because 12218571 - 2⁷ = 12218443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12213571) 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 5 ways as a sum of consecutive naturals, for example, 678801 + ... + 678818.

It is an arithmetic number, because the mean of its divisors is an integer number (2941510).

Almost surely, 2^12218571 is an apocalyptic number.

12218571 is a deficient number, since it is larger than the sum of its proper divisors (5430489).

12218571 is a wasteful number, since it uses less digits than its factorization.

12218571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357625 (or 1357622 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 12218571 is about 3495.5072593259. The cubic root of 12218571 is about 230.3245009969.

Adding to 12218571 its reverse (17581221), we get a palindrome (29799792).

The spelling of 12218571 in words is "twelve million, two hundred eighteen thousand, five hundred seventy-one".