12221221501 has 2 divisors, whose sum is σ = 12221221502. Its totient is φ = 12221221500.

The previous prime is 12221221459. The next prime is 12221221513. The reversal of 12221221501 is 10512212221.

It is a happy number.

12221221501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6588568900 + 5632652601 = 81170^2 + 75051^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221221501 - 2¹¹ = 12221219453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221221531) 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 as a sum of consecutive naturals, namely, 6110610750 + 6110610751.

It is an arithmetic number, because the mean of its divisors is an integer number (6110610751).

Almost surely, 2^12221221501 is an apocalyptic number.

It is an amenable number.

12221221501 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221221501 is an equidigital number, since it uses as much as digits as its factorization.

12221221501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 12221221501 its reverse (10512212221), we get a palindrome (22733433722).

The spelling of 12221221501 in words is "twelve billion, two hundred twenty-one million, two hundred twenty-one thousand, five hundred one".