21035089 has 4 divisors (see below), whose sum is σ = 21067956. Its totient is φ = 21002224.

The previous prime is 21035059. The next prime is 21035111. The reversal of 21035089 is 98053012.

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 13082689 + 7952400 = 3617^2 + 2820^2 .

It is a cyclic number.

It is not a de Polignac number, because 21035089 - 2¹⁷ = 20904017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21035029) 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, 15454 + ... + 16759.

It is an arithmetic number, because the mean of its divisors is an integer number (5266989).

Almost surely, 2^21035089 is an apocalyptic number.

It is an amenable number.

21035089 is a deficient number, since it is larger than the sum of its proper divisors (32867).

21035089 is an equidigital number, since it uses as much as digits as its factorization.

21035089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32866.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21035089 is about 4586.4026207912. The cubic root of 21035089 is about 276.0459954500.

The spelling of 21035089 in words is "twenty-one million, thirty-five thousand, eighty-nine".