10825721 has 4 divisors (see below), whose sum is σ = 10841700. Its totient is φ = 10809744.

The previous prime is 10825699. The next prime is 10825747. The reversal of 10825721 is 12752801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12752801 = 239 ⋅53359.

It can be written as a sum of positive squares in 2 ways, for example, as 3013696 + 7812025 = 1736^2 + 2795^2 .

It is a cyclic number.

It is not a de Polignac number, because 10825721 - 2⁶ = 10825657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10825751) 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, 6926 + ... + 8343.

It is an arithmetic number, because the mean of its divisors is an integer number (2710425).

Almost surely, 2^10825721 is an apocalyptic number.

It is an amenable number.

10825721 is a deficient number, since it is larger than the sum of its proper divisors (15979).

10825721 is an equidigital number, since it uses as much as digits as its factorization.

10825721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15978.

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

The square root of 10825721 is about 3290.2463433609. The cubic root of 10825721 is about 221.2172266776.

The spelling of 10825721 in words is "ten million, eight hundred twenty-five thousand, seven hundred twenty-one".