21225122 has 8 divisors (see below), whose sum is σ = 32438556. Its totient is φ = 10412272.

The previous prime is 21225121. The next prime is 21225179. The reversal of 21225122 is 22152212.

It can be written as a sum of positive squares in 2 ways, for example, as 19811401 + 1413721 = 4451^2 + 1189^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21225122.

It is not an unprimeable number, because it can be changed into a prime (21225121) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 100013 + ... + 100224.

Almost surely, 2^21225122 is an apocalyptic number.

21225122 is a deficient number, since it is larger than the sum of its proper divisors (11213434).

21225122 is a wasteful number, since it uses less digits than its factorization.

21225122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200292.

The product of its digits is 160, while the sum is 17.

The square root of 21225122 is about 4607.0730404455. The cubic root of 21225122 is about 276.8747799477.

Adding to 21225122 its reverse (22152212), we get a palindrome (43377334).

The spelling of 21225122 in words is "twenty-one million, two hundred twenty-five thousand, one hundred twenty-two".