21332189 has 2 divisors, whose sum is σ = 21332190. Its totient is φ = 21332188.

The previous prime is 21332183. The next prime is 21332209. The reversal of 21332189 is 98123312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21252100 + 80089 = 4610^2 + 283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21332189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21332183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666094 + 10666095.

It is an arithmetic number, because the mean of its divisors is an integer number (10666095).

Almost surely, 2^21332189 is an apocalyptic number.

It is an amenable number.

21332189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332189 is an equidigital number, since it uses as much as digits as its factorization.

21332189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 21332189 is about 4618.6782741386. The cubic root of 21332189 is about 277.3395506740.

The spelling of 21332189 in words is "twenty-one million, three hundred thirty-two thousand, one hundred eighty-nine".