21126422 has 8 divisors (see below), whose sum is σ = 31719072. Its totient is φ = 10553400.

The previous prime is 21126421. The next prime is 21126431. The reversal of 21126422 is 22462112.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21126394 and 21126403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126421) 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 3 ways as a sum of consecutive naturals, for example, 1829 + ... + 6752.

It is an arithmetic number, because the mean of its divisors is an integer number (3964884).

Almost surely, 2^21126422 is an apocalyptic number.

21126422 is a deficient number, since it is larger than the sum of its proper divisors (10592650).

21126422 is a wasteful number, since it uses less digits than its factorization.

21126422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9814.

The product of its digits is 384, while the sum is 20.

The square root of 21126422 is about 4596.3487683160. The cubic root of 21126422 is about 276.4449432413. Note that the first 3 decimals are identical.

Adding to 21126422 its reverse (22462112), we get a palindrome (43588534).

The spelling of 21126422 in words is "twenty-one million, one hundred twenty-six thousand, four hundred twenty-two".