22209621 has 16 divisors (see below), whose sum is σ = 35011200. Its totient is φ = 12253248.

The previous prime is 22209619. The next prime is 22209631. The reversal of 22209621 is 12690222.

It is not a de Polignac number, because 22209621 - 2¹ = 22209619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22209591 and 22209600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22209601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17626 + ... + 18843.

It is an arithmetic number, because the mean of its divisors is an integer number (2188200).

Almost surely, 2^22209621 is an apocalyptic number.

22209621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22209621 is a deficient number, since it is larger than the sum of its proper divisors (12801579).

22209621 is a wasteful number, since it uses less digits than its factorization.

22209621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36508.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 22209621 is about 4712.7084569279. The cubic root of 22209621 is about 281.0910703072.

Adding to 22209621 its reverse (12690222), we get a palindrome (34899843).

The spelling of 22209621 in words is "twenty-two million, two hundred nine thousand, six hundred twenty-one".