12221716 has 24 divisors (see below), whose sum is σ = 23416904. Its totient is φ = 5546880.

The previous prime is 12221689. The next prime is 12221749. The reversal of 12221716 is 61712221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 688900 + 11532816 = 830^2 + 3396^2 .

It is a congruent number.

It is an unprimeable number.

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, 1246 + ... + 5098.

Almost surely, 2^12221716 is an apocalyptic number.

It is an amenable number.

12221716 is a deficient number, since it is larger than the sum of its proper divisors (11195188).

12221716 is a wasteful number, since it uses less digits than its factorization.

12221716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3931 (or 3929 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 12221716 is about 3495.9570935582. The cubic root of 12221716 is about 230.3442607657.

Adding to 12221716 its reverse (61712221), we get a palindrome (73933937).

The spelling of 12221716 in words is "twelve million, two hundred twenty-one thousand, seven hundred sixteen".