21622264 has 16 divisors (see below), whose sum is σ = 40663800. Its totient is φ = 10778592.

The previous prime is 21622259. The next prime is 21622267. The reversal of 21622264 is 46222612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1119 + ... + 6670.

Almost surely, 2^21622264 is an apocalyptic number.

It is an amenable number.

21622264 is a deficient number, since it is larger than the sum of its proper divisors (19041536).

21622264 is a wasteful number, since it uses less digits than its factorization.

21622264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8142 (or 8138 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 21622264 is about 4649.9746235867. The cubic root of 21622264 is about 278.5909826542.

Adding to 21622264 its reverse (46222612), we get a palindrome (67844876).

The spelling of 21622264 in words is "twenty-one million, six hundred twenty-two thousand, two hundred sixty-four".