12530021135 has 4 divisors (see below), whose sum is σ = 15036025368. Its totient is φ = 10024016904.

The previous prime is 12530021131. The next prime is 12530021171. The reversal of 12530021135 is 53112003521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53112003521 = 101 ⋅525861421.

It is a cyclic number.

It is not a de Polignac number, because 12530021135 - 2² = 12530021131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12530021135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12530021131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1253002109 + ... + 1253002118.

It is an arithmetic number, because the mean of its divisors is an integer number (3759006342).

Almost surely, 2^12530021135 is an apocalyptic number.

12530021135 is a deficient number, since it is larger than the sum of its proper divisors (2506004233).

12530021135 is an equidigital number, since it uses as much as digits as its factorization.

12530021135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506004232.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 12530021135 its reverse (53112003521), we get a palindrome (65642024656).

The spelling of 12530021135 in words is "twelve billion, five hundred thirty million, twenty-one thousand, one hundred thirty-five".