12311221001 has 2 divisors, whose sum is σ = 12311221002. Its totient is φ = 12311221000.

The previous prime is 12311220997. The next prime is 12311221033. The reversal of 12311221001 is 10012211321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10670890000 + 1640331001 = 103300^2 + 40501^2 .

It is a cyclic number.

It is not a de Polignac number, because 12311221001 - 2² = 12311220997 is a prime.

It is not a weakly prime, because it can be changed into another prime (12311224001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155610500 + 6155610501.

It is an arithmetic number, because the mean of its divisors is an integer number (6155610501).

Almost surely, 2^12311221001 is an apocalyptic number.

It is an amenable number.

12311221001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311221001 is an equidigital number, since it uses as much as digits as its factorization.

12311221001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 12311221001 its reverse (10012211321), we get a palindrome (22323432322).

The spelling of 12311221001 in words is "twelve billion, three hundred eleven million, two hundred twenty-one thousand, one".