21059089 has 2 divisors, whose sum is σ = 21059090. Its totient is φ = 21059088.

The previous prime is 21059081. The next prime is 21059119. The reversal of 21059089 is 98095012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 36864 = 4585^2 + 192^2 .

It is a cyclic number.

It is not a de Polignac number, because 21059089 - 2³ = 21059081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21059081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10529544 + 10529545.

It is an arithmetic number, because the mean of its divisors is an integer number (10529545).

Almost surely, 2^21059089 is an apocalyptic number.

It is an amenable number.

21059089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21059089 is an equidigital number, since it uses as much as digits as its factorization.

21059089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 21059089 is about 4589.0183046050. The cubic root of 21059089 is about 276.1509405071.

The spelling of 21059089 in words is "twenty-one million, fifty-nine thousand, eighty-nine".