12865056821 has 8 divisors (see below), whose sum is σ = 13310650080. Its totient is φ = 12419594992.

The previous prime is 12865056803. The next prime is 12865056847.

12865056821 is nontrivially palindromic in base 10.

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 12865056821 - 2²² = 12860862517 is a prime.

It is a super-3 number, since 3×12865056821³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12865056851) 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, 192626 + ... + 250668.

It is an arithmetic number, because the mean of its divisors is an integer number (1663831260).

Almost surely, 2^12865056821 is an apocalyptic number.

It is an amenable number.

12865056821 is a deficient number, since it is larger than the sum of its proper divisors (445593259).

12865056821 is an equidigital number, since it uses as much as digits as its factorization.

12865056821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65715.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 12865056821 in words is "twelve billion, eight hundred sixty-five million, fifty-six thousand, eight hundred twenty-one".