12267123801521 has 2 divisors, whose sum is σ = 12267123801522. Its totient is φ = 12267123801520.

The previous prime is 12267123801479. The next prime is 12267123801533. The reversal of 12267123801521 is 12510832176221.

It is a happy number.

12267123801521 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., 6828265479025 + 5438858322496 = 2613095^2 + 2332136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12267123801521 is a prime.

It is not a weakly prime, because it can be changed into another prime (12267123881521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6133561900760 + 6133561900761.

It is an arithmetic number, because the mean of its divisors is an integer number (6133561900761).

Almost surely, 2^{12267123801521} is an apocalyptic number.

It is an amenable number.

12267123801521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12267123801521 is an equidigital number, since it uses as much as digits as its factorization.

12267123801521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 41.

Adding to 12267123801521 its reverse (12510832176221), we get a palindrome (24777955977742).

The spelling of 12267123801521 in words is "twelve trillion, two hundred sixty-seven billion, one hundred twenty-three million, eight hundred one thousand, five hundred twenty-one".