21322445 has 8 divisors (see below), whose sum is σ = 25613280. Its totient is φ = 17040400.

The previous prime is 21322439. The next prime is 21322463. The reversal of 21322445 is 54422312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21322445 - 2⁶ = 21322381 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 21322445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5786 + ... + 8724.

It is an arithmetic number, because the mean of its divisors is an integer number (3201660).

Almost surely, 2^21322445 is an apocalyptic number.

It is an amenable number.

21322445 is a deficient number, since it is larger than the sum of its proper divisors (4290835).

21322445 is a wasteful number, since it uses less digits than its factorization.

21322445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4395.

The product of its digits is 1920, while the sum is 23.

The square root of 21322445 is about 4617.6233064207. The cubic root of 21322445 is about 277.2973170312.

Adding to 21322445 its reverse (54422312), we get a palindrome (75744757).

The spelling of 21322445 in words is "twenty-one million, three hundred twenty-two thousand, four hundred forty-five".