12707821 has 4 divisors (see below), whose sum is σ = 14523232. Its totient is φ = 10892412.

The previous prime is 12707801. The next prime is 12707837. The reversal of 12707821 is 12870721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12707821 - 2⁷ = 12707693 is a prime.

It is a super-2 number, since 2×12707821² = 322977429136082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12707821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12707801) 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, 907695 + ... + 907708.

It is an arithmetic number, because the mean of its divisors is an integer number (3630808).

Almost surely, 2^12707821 is an apocalyptic number.

It is an amenable number.

12707821 is a deficient number, since it is larger than the sum of its proper divisors (1815411).

12707821 is an equidigital number, since it uses as much as digits as its factorization.

12707821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815410.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 12707821 is about 3564.8030801154. The cubic root of 12707821 is about 233.3585385470.

The spelling of 12707821 in words is "twelve million, seven hundred seven thousand, eight hundred twenty-one".