21600101 has 6 divisors (see below), whose sum is σ = 21883302. Its totient is φ = 21320520.

The previous prime is 21600091. The next prime is 21600121. The reversal of 21600101 is 10100612.

It can be written as a sum of positive squares in only one way, i.e., 15602500 + 5997601 = 3950^2 + 2449^2 .

It is not a de Polignac number, because 21600101 - 2⁶ = 21600037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4511 + ... + 7971.

It is an arithmetic number, because the mean of its divisors is an integer number (3647217).

Almost surely, 2^21600101 is an apocalyptic number.

It is an amenable number.

21600101 is a deficient number, since it is larger than the sum of its proper divisors (283201).

21600101 is an frugal number, since it uses more digits than its factorization.

21600101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3619 (or 3540 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 21600101 is about 4647.5908813061. The cubic root of 21600101 is about 278.4957640906.

Adding to 21600101 its reverse (10100612), we get a palindrome (31700713).

The spelling of 21600101 in words is "twenty-one million, six hundred thousand, one hundred one".