22100644 has 12 divisors (see below), whose sum is σ = 39923968. Its totient is φ = 10693800.

The previous prime is 22100641. The next prime is 22100651. The reversal of 22100644 is 44600122.

It is not an unprimeable number, because it can be changed into a prime (22100641) 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 3 ways as a sum of consecutive naturals, for example, 88992 + ... + 89239.

Almost surely, 2^22100644 is an apocalyptic number.

It is an amenable number.

22100644 is a deficient number, since it is larger than the sum of its proper divisors (17823324).

22100644 is a wasteful number, since it uses less digits than its factorization.

22100644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178266 (or 178264 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 22100644 is about 4701.1322040547. The cubic root of 22100644 is about 280.6305686697.

Adding to 22100644 its reverse (44600122), we get a palindrome (66700766).

The spelling of 22100644 in words is "twenty-two million, one hundred thousand, six hundred forty-four".