21310301 has 2 divisors, whose sum is σ = 21310302. Its totient is φ = 21310300.

The previous prime is 21310297. The next prime is 21310309. The reversal of 21310301 is 10301312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13498276 + 7812025 = 3674^2 + 2795^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310301 - 2² = 21310297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310309) 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 as a sum of consecutive naturals, namely, 10655150 + 10655151.

It is an arithmetic number, because the mean of its divisors is an integer number (10655151).

Almost surely, 2^21310301 is an apocalyptic number.

It is an amenable number.

21310301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310301 is an equidigital number, since it uses as much as digits as its factorization.

21310301 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21310301 is about 4616.3081569583. The cubic root of 21310301 is about 277.2446629988.

Adding to 21310301 its reverse (10301312), we get a palindrome (31611613).

The spelling of 21310301 in words is "twenty-one million, three hundred ten thousand, three hundred one".