21622244 has 24 divisors (see below), whose sum is σ = 43393728. Its totient is φ = 9234720.

The previous prime is 21622241. The next prime is 21622259. The reversal of 21622244 is 44222612.

It is not an unprimeable number, because it can be changed into a prime (21622241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8102 + ... + 10434.

It is an arithmetic number, because the mean of its divisors is an integer number (1808072).

Almost surely, 2^21622244 is an apocalyptic number.

It is an amenable number.

21622244 is an abundant number, since it is smaller than the sum of its proper divisors (21771484).

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

21622244 is a wasteful number, since it uses less digits than its factorization.

21622244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675 (or 2673 counting only the distinct ones).

The product of its digits is 1536, while the sum is 23.

The square root of 21622244 is about 4649.9724730368. The cubic root of 21622244 is about 278.5908967578.

Adding to 21622244 its reverse (44222612), we get a palindrome (65844856).

The spelling of 21622244 in words is "twenty-one million, six hundred twenty-two thousand, two hundred forty-four".