12621507529 has 2 divisors, whose sum is σ = 12621507530. Its totient is φ = 12621507528.

The previous prime is 12621507497. The next prime is 12621507551. The reversal of 12621507529 is 92570512621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6638175625 + 5983331904 = 81475^2 + 77352^2 .

It is a cyclic number.

It is not a de Polignac number, because 12621507529 - 2⁵ = 12621507497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12621507491 and 12621507500.

It is not a weakly prime, because it can be changed into another prime (12621507559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6310753764 + 6310753765.

It is an arithmetic number, because the mean of its divisors is an integer number (6310753765).

Almost surely, 2^12621507529 is an apocalyptic number.

It is an amenable number.

12621507529 is a deficient number, since it is larger than the sum of its proper divisors (1).

12621507529 is an equidigital number, since it uses as much as digits as its factorization.

12621507529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 12621507529 in words is "twelve billion, six hundred twenty-one million, five hundred seven thousand, five hundred twenty-nine".