12240312221 has 16 divisors (see below), whose sum is σ = 13132142400. Its totient is φ = 11374121088.

The previous prime is 12240312181. The next prime is 12240312223. The reversal of 12240312221 is 12221304221.

It is a de Polignac number, because none of the positive numbers 2^k-12240312221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12240312193 and 12240312202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12240312223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500351 + ... + 524243.

It is an arithmetic number, because the mean of its divisors is an integer number (820758900).

Almost surely, 2^12240312221 is an apocalyptic number.

It is an amenable number.

12240312221 is a deficient number, since it is larger than the sum of its proper divisors (891830179).

12240312221 is a wasteful number, since it uses less digits than its factorization.

12240312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24428.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 12240312221 its reverse (12221304221), we get a palindrome (24461616442).

The spelling of 12240312221 in words is "twelve billion, two hundred forty million, three hundred twelve thousand, two hundred twenty-one".