21103301 has 2 divisors, whose sum is σ = 21103302. Its totient is φ = 21103300.

The previous prime is 21103267. The next prime is 21103309. The reversal of 21103301 is 10330112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 4708900 = 4049^2 + 2170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21103301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21103309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551650 + 10551651.

It is an arithmetic number, because the mean of its divisors is an integer number (10551651).

Almost surely, 2^21103301 is an apocalyptic number.

It is an amenable number.

21103301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103301 is an equidigital number, since it uses as much as digits as its factorization.

21103301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 21103301 is about 4593.8329312242. The cubic root of 21103301 is about 276.3440582505.

Adding to 21103301 its reverse (10330112), we get a palindrome (31433413).

The spelling of 21103301 in words is "twenty-one million, one hundred three thousand, three hundred one".