12221516 has 12 divisors (see below), whose sum is σ = 21584640. Its totient is φ = 6054480.

The previous prime is 12221497. The next prime is 12221519. The reversal of 12221516 is 61512221.

It is not an unprimeable number, because it can be changed into a prime (12221519) 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 3 ways as a sum of consecutive naturals, for example, 13580 + ... + 14451.

It is an arithmetic number, because the mean of its divisors is an integer number (1798720).

Almost surely, 2^12221516 is an apocalyptic number.

It is an amenable number.

12221516 is a deficient number, since it is larger than the sum of its proper divisors (9363124).

12221516 is a wasteful number, since it uses less digits than its factorization.

12221516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28144 (or 28142 counting only the distinct ones).

The product of its digits is 240, while the sum is 20.

The square root of 12221516 is about 3495.9284889711. The cubic root of 12221516 is about 230.3430042836.

Adding to 12221516 its reverse (61512221), we get a palindrome (73733737).

It can be divided in two parts, 12221 and 516, that multiplied together give a palindrome (6306036).

The spelling of 12221516 in words is "twelve million, two hundred twenty-one thousand, five hundred sixteen".