21223122 has 8 divisors (see below), whose sum is σ = 42446256. Its totient is φ = 7074372.

The previous prime is 21223093. The next prime is 21223141. The reversal of 21223122 is 22132212.

It is a happy number.

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

21223122 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

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 3 ways as a sum of consecutive naturals, for example, 1768588 + ... + 1768599.

It is an arithmetic number, because the mean of its divisors is an integer number (5305782).

Almost surely, 2^21223122 is an apocalyptic number.

21223122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21223122 is a wasteful number, since it uses less digits than its factorization.

21223122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537192.

The product of its digits is 96, while the sum is 15.

The square root of 21223122 is about 4606.8559777792. The cubic root of 21223122 is about 276.8660832258.

Adding to 21223122 its reverse (22132212), we get a palindrome (43355334).

The spelling of 21223122 in words is "twenty-one million, two hundred twenty-three thousand, one hundred twenty-two".