12755821 has 16 divisors (see below), whose sum is σ = 14808640. Its totient is φ = 10886400.

The previous prime is 12755807. The next prime is 12755833. The reversal of 12755821 is 12855721.

12755821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a 5-Lehmer number, since φ(12755821) divides (12755821-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 12755821 - 2⁷ = 12755693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12755851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10021 + ... + 11221.

It is an arithmetic number, because the mean of its divisors is an integer number (925540).

Almost surely, 2^12755821 is an apocalyptic number.

It is an amenable number.

12755821 is a deficient number, since it is larger than the sum of its proper divisors (2052819).

12755821 is a wasteful number, since it uses less digits than its factorization.

12755821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276.

The product of its digits is 5600, while the sum is 31.

The square root of 12755821 is about 3571.5292242959. The cubic root of 12755821 is about 233.6519834603.

The spelling of 12755821 in words is "twelve million, seven hundred fifty-five thousand, eight hundred twenty-one".