21100200244 has 6 divisors (see below), whose sum is σ = 36925350434. Its totient is φ = 10550100120.

The previous prime is 21100200241. The next prime is 21100200263. The reversal of 21100200244 is 44200200112.

It can be written as a sum of positive squares in only one way, i.e., 13181336100 + 7918864144 = 114810^2 + 88988^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100200241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2637525027 + ... + 2637525034.

Almost surely, 2^21100200244 is an apocalyptic number.

It is an amenable number.

21100200244 is a deficient number, since it is larger than the sum of its proper divisors (15825150190).

21100200244 is a wasteful number, since it uses less digits than its factorization.

21100200244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5275050065 (or 5275050063 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21100200244 its reverse (44200200112), we get a palindrome (65300400356).

The spelling of 21100200244 in words is "twenty-one billion, one hundred million, two hundred thousand, two hundred forty-four".