21322424 has 32 divisors (see below), whose sum is σ = 41958000. Its totient is φ = 10144512.

The previous prime is 21322417. The next prime is 21322439. The reversal of 21322424 is 42422312.

It is a junction number, because it is equal to n+sod(n) for n = 21322396 and 21322405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16307 + ... + 17565.

Almost surely, 2^21322424 is an apocalyptic number.

It is an amenable number.

21322424 is a deficient number, since it is larger than the sum of its proper divisors (20635576).

21322424 is a wasteful number, since it uses less digits than its factorization.

21322424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367 (or 1363 counting only the distinct ones).

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

The square root of 21322424 is about 4617.6210325231. The cubic root of 21322424 is about 277.2972259965.

Adding to 21322424 its reverse (42422312), we get a palindrome (63744736).

The spelling of 21322424 in words is "twenty-one million, three hundred twenty-two thousand, four hundred twenty-four".