12179621247 has 4 divisors (see below), whose sum is σ = 16239495000. Its totient is φ = 8119747496.

The previous prime is 12179621221. The next prime is 12179621249. The reversal of 12179621247 is 74212697121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12179621247 - 2¹⁶ = 12179555711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12179621199 and 12179621208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12179621249) 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, 2029936872 + ... + 2029936877.

It is an arithmetic number, because the mean of its divisors is an integer number (4059873750).

Almost surely, 2^12179621247 is an apocalyptic number.

12179621247 is a deficient number, since it is larger than the sum of its proper divisors (4059873753).

12179621247 is an equidigital number, since it uses as much as digits as its factorization.

12179621247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4059873752.

The product of its digits is 84672, while the sum is 42.

The spelling of 12179621247 in words is "twelve billion, one hundred seventy-nine million, six hundred twenty-one thousand, two hundred forty-seven".