10851721 has 2 divisors, whose sum is σ = 10851722. Its totient is φ = 10851720.

The previous prime is 10851719. The next prime is 10851733. The reversal of 10851721 is 12715801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10653696 + 198025 = 3264^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 10851721 - 2¹ = 10851719 is a prime.

Together with 10851719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (10851751) 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 as a sum of consecutive naturals, namely, 5425860 + 5425861.

It is an arithmetic number, because the mean of its divisors is an integer number (5425861).

Almost surely, 2^10851721 is an apocalyptic number.

It is an amenable number.

10851721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10851721 is an equidigital number, since it uses as much as digits as its factorization.

10851721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 10851721 is about 3294.1950458344. The cubic root of 10851721 is about 221.3941833125.

The spelling of 10851721 in words is "ten million, eight hundred fifty-one thousand, seven hundred twenty-one".