21324301 has 2 divisors, whose sum is σ = 21324302. Its totient is φ = 21324300.

The previous prime is 21324287. The next prime is 21324313. The reversal of 21324301 is 10342312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19811401 + 1512900 = 4451^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 21324301 - 2⁹ = 21323789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21324361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662150 + 10662151.

It is an arithmetic number, because the mean of its divisors is an integer number (10662151).

Almost surely, 2^21324301 is an apocalyptic number.

It is an amenable number.

21324301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324301 is an equidigital number, since it uses as much as digits as its factorization.

21324301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21324301 is about 4617.8242712342. The cubic root of 21324301 is about 277.3053625264.

Adding to 21324301 its reverse (10342312), we get a palindrome (31666613).

The spelling of 21324301 in words is "twenty-one million, three hundred twenty-four thousand, three hundred one".