21113089 has 2 divisors, whose sum is σ = 21113090. Its totient is φ = 21113088.

The previous prime is 21113087. The next prime is 21113101. The reversal of 21113089 is 98031112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19713600 + 1399489 = 4440^2 + 1183^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113089 - 2¹ = 21113087 is a prime.

Together with 21113087, it forms a pair of twin primes.

It is equal to p_1336651 and since 21113089 and 1336651 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21113083) 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 as a sum of consecutive naturals, namely, 10556544 + 10556545.

It is an arithmetic number, because the mean of its divisors is an integer number (10556545).

Almost surely, 2^21113089 is an apocalyptic number.

It is an amenable number.

21113089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113089 is an equidigital number, since it uses as much as digits as its factorization.

21113089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 21113089 is about 4594.8981490344. The cubic root of 21113089 is about 276.3867756998.

The spelling of 21113089 in words is "twenty-one million, one hundred thirteen thousand, eighty-nine".