12221244578 has 8 divisors (see below), whose sum is σ = 18333628572. Its totient is φ = 6110035056.

The previous prime is 12221244577. The next prime is 12221244589. The reversal of 12221244578 is 87544212221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12012817609 + 208426969 = 109603^2 + 14437^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12221244577) 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, 267125 + ... + 309512.

Almost surely, 2^12221244578 is an apocalyptic number.

12221244578 is a deficient number, since it is larger than the sum of its proper divisors (6112383994).

12221244578 is a wasteful number, since it uses less digits than its factorization.

12221244578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587236.

The product of its digits is 71680, while the sum is 38.

Adding to 12221244578 its reverse (87544212221), we get a palindrome (99765456799).

The spelling of 12221244578 in words is "twelve billion, two hundred twenty-one million, two hundred forty-four thousand, five hundred seventy-eight".