10265821 has 4 divisors (see below), whose sum is σ = 10340892. Its totient is φ = 10190752.

The previous prime is 10265809. The next prime is 10265831. The reversal of 10265821 is 12856201.

10265821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5040025 + 5225796 = 2245^2 + 2286^2 .

It is a cyclic number.

It is not a de Polignac number, because 10265821 - 2⁵ = 10265789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10265831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37330 + ... + 37603.

It is an arithmetic number, because the mean of its divisors is an integer number (2585223).

Almost surely, 2^10265821 is an apocalyptic number.

It is an amenable number.

10265821 is a deficient number, since it is larger than the sum of its proper divisors (75071).

10265821 is an equidigital number, since it uses as much as digits as its factorization.

10265821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75070.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 10265821 is about 3204.0319911012. The cubic root of 10265821 is about 217.3357795046.

It can be divided in two parts, 10265 and 821, that multiplied together give a triangular number (8427565 = T₄₁₀₅).

The spelling of 10265821 in words is "ten million, two hundred sixty-five thousand, eight hundred twenty-one".