21284041 has 2 divisors, whose sum is σ = 21284042. Its totient is φ = 21284040.

The previous prime is 21283987. The next prime is 21284093. The reversal of 21284041 is 14048212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18147600 + 3136441 = 4260^2 + 1771^2 .

It is a cyclic number.

It is not a de Polignac number, because 21284041 - 2¹⁷ = 21152969 is a prime.

It is not a weakly prime, because it can be changed into another prime (21284141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10642020 + 10642021.

It is an arithmetic number, because the mean of its divisors is an integer number (10642021).

Almost surely, 2^21284041 is an apocalyptic number.

It is an amenable number.

21284041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21284041 is an equidigital number, since it uses as much as digits as its factorization.

21284041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 21284041 is about 4613.4630160000. The cubic root of 21284041 is about 277.1307362898.

The spelling of 21284041 in words is "twenty-one million, two hundred eighty-four thousand, forty-one".