21200122 has 16 divisors (see below), whose sum is σ = 33782400. Its totient is φ = 9943488.

The previous prime is 21200117. The next prime is 21200129. The reversal of 21200122 is 22100212.

It is a junction number, because it is equal to n+sod(n) for n = 21200099 and 21200108.

It is not an unprimeable number, because it can be changed into a prime (21200129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11629 + ... + 13327.

It is an arithmetic number, because the mean of its divisors is an integer number (2111400).

Almost surely, 2^21200122 is an apocalyptic number.

21200122 is a deficient number, since it is larger than the sum of its proper divisors (12582278).

21200122 is a wasteful number, since it uses less digits than its factorization.

21200122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21200122 is about 4604.3590216229. The cubic root of 21200122 is about 276.7660316302.

Adding to 21200122 its reverse (22100212), we get a palindrome (43300334).

The spelling of 21200122 in words is "twenty-one million, two hundred thousand, one hundred twenty-two".