12221471249 has 4 divisors (see below), whose sum is σ = 13161584436. Its totient is φ = 11281358064.

The previous prime is 12221471237. The next prime is 12221471261. The reversal of 12221471249 is 94217412221.

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 (12221471237) and next prime (12221471261).

It can be written as a sum of positive squares in 2 ways, for example, as 6405121024 + 5816350225 = 80032^2 + 76265^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221471249 - 2⁴ = 12221471233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12221471219) 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, 470056574 + ... + 470056599.

It is an arithmetic number, because the mean of its divisors is an integer number (3290396109).

Almost surely, 2^12221471249 is an apocalyptic number.

It is an amenable number.

12221471249 is a deficient number, since it is larger than the sum of its proper divisors (940113187).

12221471249 is an equidigital number, since it uses as much as digits as its factorization.

12221471249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940113186.

The product of its digits is 16128, while the sum is 35.

The spelling of 12221471249 in words is "twelve billion, two hundred twenty-one million, four hundred seventy-one thousand, two hundred forty-nine".