21225622 has 64 divisors (see below), whose sum is σ = 40435200. Its totient is φ = 8225280.

The previous prime is 21225613. The next prime is 21225629. The reversal of 21225622 is 22652212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21225593 and 21225602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225629) 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 31 ways as a sum of consecutive naturals, for example, 206023 + ... + 206125.

It is an arithmetic number, because the mean of its divisors is an integer number (631800).

Almost surely, 2^21225622 is an apocalyptic number.

21225622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21225622 is a deficient number, since it is larger than the sum of its proper divisors (19209578).

21225622 is a wasteful number, since it uses less digits than its factorization.

21225622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181.

The product of its digits is 960, while the sum is 22.

The square root of 21225622 is about 4607.1273045142. The cubic root of 21225622 is about 276.8769540429.

Adding to 21225622 its reverse (22652212), we get a palindrome (43877834).

It can be divided in two parts, 2122 and 5622, that added together give a square (7744 = 88²).

The spelling of 21225622 in words is "twenty-one million, two hundred twenty-five thousand, six hundred twenty-two".