12121217 has 16 divisors (see below), whose sum is σ = 13171200. Its totient is φ = 11128320.

The previous prime is 12121211. The next prime is 12121231. The reversal of 12121217 is 71212121.

It is a cyclic number.

It is not a de Polignac number, because 12121217 - 2¹² = 12117121 is a prime.

It is a super-2 number, since 2×12121217² = 293847803122178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121195 and 12121204.

It is not an unprimeable number, because it can be changed into a prime (12121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87134 + ... + 87272.

It is an arithmetic number, because the mean of its divisors is an integer number (823200).

Almost surely, 2^12121217 is an apocalyptic number.

It is an amenable number.

12121217 is a deficient number, since it is larger than the sum of its proper divisors (1049983).

12121217 is a wasteful number, since it uses less digits than its factorization.

12121217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296.

The product of its digits is 56, while the sum is 17.

The square root of 12121217 is about 3481.5538197765. The cubic root of 12121217 is about 229.7111496805.

Adding to 12121217 its reverse (71212121), we get a palindrome (83333338).

The spelling of 12121217 in words is "twelve million, one hundred twenty-one thousand, two hundred seventeen".