12221471 has 4 divisors (see below), whose sum is σ = 12615744. Its totient is φ = 11827200.

The previous prime is 12221459. The next prime is 12221483. The reversal of 12221471 is 17412221.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (12221459) and next prime (12221483).

It is a cyclic number.

It is not a de Polignac number, because 12221471 - 2¹⁰ = 12220447 is a prime.

It is a super-3 number, since 3×12221471³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197090 + ... + 197151.

It is an arithmetic number, because the mean of its divisors is an integer number (3153936).

Almost surely, 2^12221471 is an apocalyptic number.

12221471 is a deficient number, since it is larger than the sum of its proper divisors (394273).

12221471 is an equidigital number, since it uses as much as digits as its factorization.

12221471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394272.

The product of its digits is 224, while the sum is 20.

The square root of 12221471 is about 3495.9220529068. The cubic root of 12221471 is about 230.3427215732.

Adding to 12221471 its reverse (17412221), we get a palindrome (29633692).

The spelling of 12221471 in words is "twelve million, two hundred twenty-one thousand, four hundred seventy-one".