10821709 has 2 divisors, whose sum is σ = 10821710. Its totient is φ = 10821708.

The previous prime is 10821689. The next prime is 10821719. The reversal of 10821709 is 90712801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10259209 + 562500 = 3203^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 10821709 - 2⁵ = 10821677 is a prime.

It is a Chen prime.

It is equal to p₇₁₅₄₉₂ and since 10821709 and 715492 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10821719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5410854 + 5410855.

It is an arithmetic number, because the mean of its divisors is an integer number (5410855).

Almost surely, 2^10821709 is an apocalyptic number.

It is an amenable number.

10821709 is a deficient number, since it is larger than the sum of its proper divisors (1).

10821709 is an equidigital number, since it uses as much as digits as its factorization.

10821709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 10821709 is about 3289.6366060706. The cubic root of 10821709 is about 221.1898956828.

The spelling of 10821709 in words is "ten million, eight hundred twenty-one thousand, seven hundred nine".