21322245 has 32 divisors (see below), whose sum is σ = 39640320. Its totient is φ = 9584640.

The previous prime is 21322241. The next prime is 21322277. The reversal of 21322245 is 54222312.

It is not a de Polignac number, because 21322245 - 2² = 21322241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21322241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4741 + ... + 8069.

It is an arithmetic number, because the mean of its divisors is an integer number (1238760).

Almost surely, 2^21322245 is an apocalyptic number.

It is an amenable number.

21322245 is a deficient number, since it is larger than the sum of its proper divisors (18318075).

21322245 is a wasteful number, since it uses less digits than its factorization.

21322245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3405.

The product of its digits is 960, while the sum is 21.

The square root of 21322245 is about 4617.6016502076. The cubic root of 21322245 is about 277.2964500319.

Adding to 21322245 its reverse (54222312), we get a palindrome (75544557).

The spelling of 21322245 in words is "twenty-one million, three hundred twenty-two thousand, two hundred forty-five".