2089921 has 4 divisors (see below), whose sum is σ = 2124244. Its totient is φ = 2055600.

The previous prime is 2089897. The next prime is 2089933. The reversal of 2089921 is 1299802.

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 1166400 + 923521 = 1080^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 2089921 - 2⁵ = 2089889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2089951) 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, 17070 + ... + 17191.

It is an arithmetic number, because the mean of its divisors is an integer number (531061).

2^2089921 is an apocalyptic number.

It is an amenable number.

2089921 is a deficient number, since it is larger than the sum of its proper divisors (34323).

2089921 is an equidigital number, since it uses as much as digits as its factorization.

2089921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34322.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2089921 is about 1445.6559065006. The cubic root of 2089921 is about 127.8527155190.

The spelling of 2089921 in words is "two million, eighty-nine thousand, nine hundred twenty-one".