12311000221 has 16 divisors (see below), whose sum is σ = 13726989360. Its totient is φ = 10962685440.

The previous prime is 12311000213. The next prime is 12311000227. The reversal of 12311000221 is 12200011321.

It can be written as a sum of positive squares in 8 ways, for example, as 153512100 + 12157488121 = 12390^2 + 110261^2 .

It is a cyclic number.

It is not a de Polignac number, because 12311000221 - 2³ = 12311000213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12311000227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443841 + ... + 470761.

It is an arithmetic number, because the mean of its divisors is an integer number (857936835).

Almost surely, 2^12311000221 is an apocalyptic number.

It is an amenable number.

12311000221 is a deficient number, since it is larger than the sum of its proper divisors (1415989139).

12311000221 is a wasteful number, since it uses less digits than its factorization.

12311000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28176.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12311000221 its reverse (12200011321), we get a palindrome (24511011542).

The spelling of 12311000221 in words is "twelve billion, three hundred eleven million, two hundred twenty-one", and thus it is an aban number.