21070089 has 12 divisors (see below), whose sum is σ = 32225076. Its totient is φ = 13220352.

The previous prime is 21070081. The next prime is 21070099. The reversal of 21070089 is 98007012.

It can be written as a sum of positive squares in 2 ways, for example, as 9455625 + 11614464 = 3075^2 + 3408^2 .

It is not a de Polignac number, because 21070089 - 2³ = 21070081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21070081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68704 + ... + 69009.

It is an arithmetic number, because the mean of its divisors is an integer number (2685423).

Almost surely, 2^21070089 is an apocalyptic number.

It is an amenable number.

21070089 is a deficient number, since it is larger than the sum of its proper divisors (11154987).

21070089 is a wasteful number, since it uses less digits than its factorization.

21070089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137736 (or 137733 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 21070089 is about 4590.2166615531. The cubic root of 21070089 is about 276.1990136788.

The spelling of 21070089 in words is "twenty-one million, seventy thousand, eighty-nine".