21522189 has 16 divisors (see below), whose sum is σ = 31046400. Its totient is φ = 13183296.

The previous prime is 21522173. The next prime is 21522217. The reversal of 21522189 is 98122512.

It is not a de Polignac number, because 21522189 - 2⁴ = 21522173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21522139) 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 in 15 ways as a sum of consecutive naturals, for example, 8167 + ... + 10475.

It is an arithmetic number, because the mean of its divisors is an integer number (1940400).

Almost surely, 2^21522189 is an apocalyptic number.

It is an amenable number.

21522189 is a deficient number, since it is larger than the sum of its proper divisors (9524211).

21522189 is a wasteful number, since it uses less digits than its factorization.

21522189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564.

The product of its digits is 2880, while the sum is 30.

The square root of 21522189 is about 4639.2013321260. The cubic root of 21522189 is about 278.1605140695.

The spelling of 21522189 in words is "twenty-one million, five hundred twenty-two thousand, one hundred eighty-nine".