21622189 has 2 divisors, whose sum is σ = 21622190. Its totient is φ = 21622188.

The previous prime is 21622157. The next prime is 21622201. The reversal of 21622189 is 98122612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19272100 + 2350089 = 4390^2 + 1533^2 .

It is a cyclic number.

It is not a de Polignac number, because 21622189 - 2⁵ = 21622157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21622189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21620189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811094 + 10811095.

It is an arithmetic number, because the mean of its divisors is an integer number (10811095).

Almost surely, 2^21622189 is an apocalyptic number.

It is an amenable number.

21622189 is a deficient number, since it is larger than the sum of its proper divisors (1).

21622189 is an equidigital number, since it uses as much as digits as its factorization.

21622189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 21622189 is about 4649.9665590195. The cubic root of 21622189 is about 278.5906605426.

The spelling of 21622189 in words is "twenty-one million, six hundred twenty-two thousand, one hundred eighty-nine".