221132212306 has 8 divisors (see below), whose sum is σ = 331942039164. Its totient is φ = 110484865920.

The previous prime is 221132212303. The next prime is 221132212307. The reversal of 221132212306 is 603212231122.

It can be written as a sum of positive squares in 2 ways, for example, as 201294898281 + 19837314025 = 448659^2 + 140845^2 .

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 (221132212303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40616715 + ... + 40622158.

Almost surely, 2^221132212306 is an apocalyptic number.

221132212306 is a deficient number, since it is larger than the sum of its proper divisors (110809826858).

221132212306 is a wasteful number, since it uses less digits than its factorization.

221132212306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81240236.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 221132212306 its reverse (603212231122), we get a palindrome (824344443428).

The spelling of 221132212306 in words is "two hundred twenty-one billion, one hundred thirty-two million, two hundred twelve thousand, three hundred six".