12247221 has 16 divisors (see below), whose sum is σ = 18712064. Its totient is φ = 6979824.

The previous prime is 12247211. The next prime is 12247237. The reversal of 12247221 is 12274221.

It is not a de Polignac number, because 12247221 - 2⁷ = 12247093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12247211) 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 15 ways as a sum of consecutive naturals, for example, 13050 + ... + 13956.

It is an arithmetic number, because the mean of its divisors is an integer number (1169504).

Almost surely, 2^12247221 is an apocalyptic number.

It is an amenable number.

12247221 is a deficient number, since it is larger than the sum of its proper divisors (6464843).

12247221 is an equidigital number, since it uses as much as digits as its factorization.

12247221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560.

The product of its digits is 448, while the sum is 21.

The square root of 12247221 is about 3499.6029774819. The cubic root of 12247221 is about 230.5043814445.

Subtracting 12247221 from its reverse (12274221), we obtain a cube (27000 = 30³).

The spelling of 12247221 in words is "twelve million, two hundred forty-seven thousand, two hundred twenty-one".