21144301 has 2 divisors, whose sum is σ = 21144302. Its totient is φ = 21144300.

The previous prime is 21144293. The next prime is 21144307. The reversal of 21144301 is 10344112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21114025 + 30276 = 4595^2 + 174^2 .

It is a cyclic number.

It is not a de Polignac number, because 21144301 - 2³ = 21144293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21144307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572150 + 10572151.

It is an arithmetic number, because the mean of its divisors is an integer number (10572151).

Almost surely, 2^21144301 is an apocalyptic number.

It is an amenable number.

21144301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21144301 is an equidigital number, since it uses as much as digits as its factorization.

21144301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21144301 is about 4598.2932703341. The cubic root of 21144301 is about 276.5229051022.

Adding to 21144301 its reverse (10344112), we get a palindrome (31488413).

The spelling of 21144301 in words is "twenty-one million, one hundred forty-four thousand, three hundred one".