10591921 has 4 divisors (see below), whose sum is σ = 10625652. Its totient is φ = 10558192.

The previous prime is 10591909. The next prime is 10591943. The reversal of 10591921 is 12919501.

10591921 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 5574321 + 5017600 = 2361^2 + 2240^2 .

It is a cyclic number.

It is not a de Polignac number, because 10591921 - 2⁷ = 10591793 is a prime.

It is a super-2 number, since 2×10591921² = 224377580940482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10591921.

It is not an unprimeable number, because it can be changed into a prime (10591951) 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, 16390 + ... + 17023.

It is an arithmetic number, because the mean of its divisors is an integer number (2656413).

Almost surely, 2^10591921 is an apocalyptic number.

It is an amenable number.

10591921 is a deficient number, since it is larger than the sum of its proper divisors (33731).

10591921 is an equidigital number, since it uses as much as digits as its factorization.

10591921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33730.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 10591921 is about 3254.5231601573. The cubic root of 10591921 is about 219.6131009776.

The spelling of 10591921 in words is "ten million, five hundred ninety-one thousand, nine hundred twenty-one".