21424322 has 16 divisors (see below), whose sum is σ = 32959872. Its totient is φ = 10441200.

The previous prime is 21424313. The next prime is 21424327. The reversal of 21424322 is 22342412.

It is a junction number, because it is equal to n+sod(n) for n = 21424294 and 21424303.

It is not an unprimeable number, because it can be changed into a prime (21424327) 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 7 ways as a sum of consecutive naturals, for example, 12743 + ... + 14325.

It is an arithmetic number, because the mean of its divisors is an integer number (2059992).

Almost surely, 2^21424322 is an apocalyptic number.

21424322 is a deficient number, since it is larger than the sum of its proper divisors (11535550).

21424322 is a wasteful number, since it uses less digits than its factorization.

21424322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753.

The product of its digits is 768, while the sum is 20.

The square root of 21424322 is about 4628.6414853605. The cubic root of 21424322 is about 277.7382506008.

Adding to 21424322 its reverse (22342412), we get a palindrome (43766734).

The spelling of 21424322 in words is "twenty-one million, four hundred twenty-four thousand, three hundred twenty-two".