21080041 has 2 divisors, whose sum is σ = 21080042. Its totient is φ = 21080040.

The previous prime is 21080021. The next prime is 21080057. The reversal of 21080041 is 14008012.

It is a happy number.

It is an a-pointer prime, because the next prime (21080057) can be obtained adding 21080041 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19175641 + 1904400 = 4379^2 + 1380^2 .

It is a cyclic number.

It is not a de Polignac number, because 21080041 - 2¹⁷ = 20948969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21079997 and 21080024.

It is not a weakly prime, because it can be changed into another prime (21080021) 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, 10540020 + 10540021.

It is an arithmetic number, because the mean of its divisors is an integer number (10540021).

Almost surely, 2^21080041 is an apocalyptic number.

It is an amenable number.

21080041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21080041 is an equidigital number, since it uses as much as digits as its factorization.

21080041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 21080041 is about 4591.3005782676. The cubic root of 21080041 is about 276.2424923739.

Adding to 21080041 its reverse (14008012), we get a palindrome (35088053).

The spelling of 21080041 in words is "twenty-one million, eighty thousand, forty-one".