12721238369 has 8 divisors (see below), whose sum is σ = 14592208128. Its totient is φ = 10863681120.

The previous prime is 12721238357. The next prime is 12721238377. The reversal of 12721238369 is 96383212721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12721238369 - 2⁴ = 12721238353 is a prime.

It is a super-2 number, since 2×12721238369² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12721238269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3351092 + ... + 3354885.

It is an arithmetic number, because the mean of its divisors is an integer number (1824026016).

Almost surely, 2^12721238369 is an apocalyptic number.

It is an amenable number.

12721238369 is a deficient number, since it is larger than the sum of its proper divisors (1870969759).

12721238369 is an equidigital number, since it uses as much as digits as its factorization.

12721238369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6706255.

The product of its digits is 217728, while the sum is 44.

The spelling of 12721238369 in words is "twelve billion, seven hundred twenty-one million, two hundred thirty-eight thousand, three hundred sixty-nine".