12721813439 has 8 divisors (see below), whose sum is σ = 13481858880. Its totient is φ = 11963068416.

The previous prime is 12721813421. The next prime is 12721813469. The reversal of 12721813439 is 93431812721.

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 12721813439 - 2¹⁶ = 12721747903 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12721813396 and 12721813405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721813469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304919 + ... + 344120.

It is an arithmetic number, because the mean of its divisors is an integer number (1685232360).

Almost surely, 2^12721813439 is an apocalyptic number.

12721813439 is a deficient number, since it is larger than the sum of its proper divisors (760045441).

12721813439 is a wasteful number, since it uses less digits than its factorization.

12721813439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650209.

The product of its digits is 72576, while the sum is 41.

The spelling of 12721813439 in words is "twelve billion, seven hundred twenty-one million, eight hundred thirteen thousand, four hundred thirty-nine".