12821705 has 8 divisors (see below), whose sum is σ = 16569672. Its totient is φ = 9468288.

The previous prime is 12821701. The next prime is 12821717. The reversal of 12821705 is 50712821.

It can be written as a sum of positive squares in 4 ways, for example, as 2886601 + 9935104 = 1699^2 + 3152^2 .

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 12821705 - 2² = 12821701 is a prime.

It is a super-2 number, since 2×12821705² = 328792238214050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12821701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98564 + ... + 98693.

It is an arithmetic number, because the mean of its divisors is an integer number (2071209).

Almost surely, 2^12821705 is an apocalyptic number.

It is an amenable number.

12821705 is a deficient number, since it is larger than the sum of its proper divisors (3747967).

12821705 is a wasteful number, since it uses less digits than its factorization.

12821705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197275.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 12821705 is about 3580.7408451325. The cubic root of 12821705 is about 234.0535648189.

The spelling of 12821705 in words is "twelve million, eight hundred twenty-one thousand, seven hundred five".