21030301 has 2 divisors, whose sum is σ = 21030302. Its totient is φ = 21030300.

The previous prime is 21030287. The next prime is 21030313. The reversal of 21030301 is 10303012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14830201 + 6200100 = 3851^2 + 2490^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030301 - 2¹¹ = 21028253 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515150 + 10515151.

It is an arithmetic number, because the mean of its divisors is an integer number (10515151).

Almost surely, 2^21030301 is an apocalyptic number.

It is an amenable number.

21030301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030301 is an equidigital number, since it uses as much as digits as its factorization.

21030301 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 10.

The square root of 21030301 is about 4585.8806133610. The cubic root of 21030301 is about 276.0250493613.

Adding to 21030301 its reverse (10303012), we get a palindrome (31333313).

It can be divided in two parts, 2 and 1030301, that multiplied together give a palindrome (2060602).

The spelling of 21030301 in words is "twenty-one million, thirty thousand, three hundred one".