21332101 has 6 divisors (see below), whose sum is σ = 24814950. Its totient is φ = 18284616.

The previous prime is 21332089. The next prime is 21332119. The reversal of 21332101 is 10123312.

It can be written as a sum of positive squares in only one way, i.e., 13764100 + 7568001 = 3710^2 + 2751^2 .

It is not a de Polignac number, because 21332101 - 2⁹ = 21331589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217626 + ... + 217723.

It is an arithmetic number, because the mean of its divisors is an integer number (4135825).

Almost surely, 2^21332101 is an apocalyptic number.

It is an amenable number.

21332101 is a deficient number, since it is larger than the sum of its proper divisors (3482849).

21332101 is an equidigital number, since it uses as much as digits as its factorization.

21332101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435363 (or 435356 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21332101 is about 4618.6687475938. The cubic root of 21332101 is about 277.3391693111.

Adding to 21332101 its reverse (10123312), we get a palindrome (31455413).

The spelling of 21332101 in words is "twenty-one million, three hundred thirty-two thousand, one hundred one".