10165921 has 4 divisors (see below), whose sum is σ = 10516500. Its totient is φ = 9815344.

The previous prime is 10165913. The next prime is 10165933. The reversal of 10165921 is 12956101.

10165921 is digitally balanced in base 2, 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 1784896 + 8381025 = 1336^2 + 2895^2 .

It is a cyclic number.

It is not a de Polignac number, because 10165921 - 2³ = 10165913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10165951) 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, 175246 + ... + 175303.

It is an arithmetic number, because the mean of its divisors is an integer number (2629125).

Almost surely, 2^10165921 is an apocalyptic number.

It is an amenable number.

10165921 is a deficient number, since it is larger than the sum of its proper divisors (350579).

10165921 is an equidigital number, since it uses as much as digits as its factorization.

10165921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350578.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 10165921 is about 3188.4041462776. The cubic root of 10165921 is about 216.6284921567.

The spelling of 10165921 in words is "ten million, one hundred sixty-five thousand, nine hundred twenty-one".