10021765 has 8 divisors (see below), whose sum is σ = 12951288. Its totient is φ = 7400640.

The previous prime is 10021747. The next prime is 10021769. The reversal of 10021765 is 56712001.

10021765 = 2238² + 2239².

10021765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 199809 + 9821956 = 447^2 + 3134^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10021765 - 2⁷ = 10021637 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 (10021769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77026 + ... + 77155.

It is an arithmetic number, because the mean of its divisors is an integer number (1618911).

Almost surely, 2^10021765 is an apocalyptic number.

10021765 is the 2239-th centered square number.

It is an amenable number.

10021765 is a deficient number, since it is larger than the sum of its proper divisors (2929523).

10021765 is a wasteful number, since it uses less digits than its factorization.

10021765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154199.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 10021765 is about 3165.7171383432. The cubic root of 10021765 is about 215.5996599781.

Adding to 10021765 its reverse (56712001), we get a palindrome (66733766).

The spelling of 10021765 in words is "ten million, twenty-one thousand, seven hundred sixty-five".