12152231521 has 2 divisors, whose sum is σ = 12152231522. Its totient is φ = 12152231520.

The previous prime is 12152231513. The next prime is 12152231537. The reversal of 12152231521 is 12513225121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12105500625 + 46730896 = 110025^2 + 6836^2 .

It is an emirp because it is prime and its reverse (12513225121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12152231521 - 2³ = 12152231513 is a prime.

It is a super-4 number, since 4×12152231521⁴ (a number of 41 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (12152231501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6076115760 + 6076115761.

It is an arithmetic number, because the mean of its divisors is an integer number (6076115761).

Almost surely, 2^12152231521 is an apocalyptic number.

It is an amenable number.

12152231521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12152231521 is an equidigital number, since it uses as much as digits as its factorization.

12152231521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

Adding to 12152231521 its reverse (12513225121), we get a palindrome (24665456642).

The spelling of 12152231521 in words is "twelve billion, one hundred fifty-two million, two hundred thirty-one thousand, five hundred twenty-one".