12444232221 has 6 divisors (see below), whose sum is σ = 17975002110. Its totient is φ = 8296154808.

The previous prime is 12444232117. The next prime is 12444232231. The reversal of 12444232221 is 12223244421.

It is a happy number.

12444232221 is a `hidden beast` number, since 12 + 4 + 4 + 423 + 2 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12213344196 + 230888025 = 110514^2 + 15195^2 .

It is not a de Polignac number, because 12444232221 - 2¹⁰ = 12444231197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12444232231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 691346226 + ... + 691346243.

It is an arithmetic number, because the mean of its divisors is an integer number (2995833685).

Almost surely, 2^12444232221 is an apocalyptic number.

It is an amenable number.

12444232221 is a deficient number, since it is larger than the sum of its proper divisors (5530769889).

12444232221 is a wasteful number, since it uses less digits than its factorization.

12444232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382692475 (or 1382692472 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

Adding to 12444232221 its reverse (12223244421), we get a palindrome (24667476642).

The spelling of 12444232221 in words is "twelve billion, four hundred forty-four million, two hundred thirty-two thousand, two hundred twenty-one".