21236041 has 2 divisors, whose sum is σ = 21236042. Its totient is φ = 21236040.

The previous prime is 21236021. The next prime is 21236063. The reversal of 21236041 is 14063212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11532816 + 9703225 = 3396^2 + 3115^2 .

It is a cyclic number.

It is not a de Polignac number, because 21236041 - 2²³ = 12847433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21236021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10618020 + 10618021.

It is an arithmetic number, because the mean of its divisors is an integer number (10618021).

Almost surely, 2^21236041 is an apocalyptic number.

It is an amenable number.

21236041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21236041 is an equidigital number, since it uses as much as digits as its factorization.

21236041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21236041 is about 4608.2579137891. The cubic root of 21236041 is about 276.9222500707.

Adding to 21236041 its reverse (14063212), we get a palindrome (35299253).

The spelling of 21236041 in words is "twenty-one million, two hundred thirty-six thousand, forty-one".