12530145221 has 4 divisors (see below), whose sum is σ = 13669249344. Its totient is φ = 11391041100.

The previous prime is 12530145181. The next prime is 12530145281. The reversal of 12530145221 is 12254103521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12254103521 = 11 ⋅1114009411.

It is a cyclic number.

It is not a de Polignac number, because 12530145221 - 2⁶ = 12530145157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12530145281) 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, 569552045 + ... + 569552066.

It is an arithmetic number, because the mean of its divisors is an integer number (3417312336).

Almost surely, 2^12530145221 is an apocalyptic number.

12530145221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12530145221 is a deficient number, since it is larger than the sum of its proper divisors (1139104123).

12530145221 is a wasteful number, since it uses less digits than its factorization.

12530145221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139104122.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 12530145221 its reverse (12254103521), we get a palindrome (24784248742).

It can be divided in two parts, 12530 and 145221, that added together give a palindrome (157751).

The spelling of 12530145221 in words is "twelve billion, five hundred thirty million, one hundred forty-five thousand, two hundred twenty-one".