12221415 has 16 divisors (see below), whose sum is σ = 21727200. Its totient is φ = 6518016.

The previous prime is 12221413. The next prime is 12221431. The reversal of 12221415 is 51412221.

It is not a de Polignac number, because 12221415 - 2¹ = 12221413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45130 + ... + 45399.

It is an arithmetic number, because the mean of its divisors is an integer number (1357950).

Almost surely, 2^12221415 is an apocalyptic number.

12221415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12221415 is a deficient number, since it is larger than the sum of its proper divisors (9505785).

12221415 is an equidigital number, since it uses as much as digits as its factorization.

12221415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90543 (or 90537 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 12221415 is about 3495.9140435657. The cubic root of 12221415 is about 230.3423697549.

Adding to 12221415 its reverse (51412221), we get a palindrome (63633636).

The spelling of 12221415 in words is "twelve million, two hundred twenty-one thousand, four hundred fifteen".