12247137521 has 4 divisors (see below), whose sum is σ = 12328244544. Its totient is φ = 12166030500.

The previous prime is 12247137509. The next prime is 12247137533. The reversal of 12247137521 is 12573174221.

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.

It is an interprime number because it is at equal distance from previous prime (12247137509) and next prime (12247137533).

It is a cyclic number.

It is not a de Polignac number, because 12247137521 - 2¹⁰ = 12247136497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12267137521) 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, 40553285 + ... + 40553586.

It is an arithmetic number, because the mean of its divisors is an integer number (3082061136).

Almost surely, 2^12247137521 is an apocalyptic number.

It is an amenable number.

12247137521 is a deficient number, since it is larger than the sum of its proper divisors (81107023).

12247137521 is an equidigital number, since it uses as much as digits as its factorization.

12247137521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81107022.

The product of its digits is 23520, while the sum is 35.

The spelling of 12247137521 in words is "twelve billion, two hundred forty-seven million, one hundred thirty-seven thousand, five hundred twenty-one".