21654041 has 2 divisors, whose sum is σ = 21654042. Its totient is φ = 21654040.

The previous prime is 21654037. The next prime is 21654067. The reversal of 21654041 is 14045612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 1042441 = 4540^2 + 1021^2 .

It is a cyclic number.

It is not a de Polignac number, because 21654041 - 2² = 21654037 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21653998 and 21654016.

It is not a weakly prime, because it can be changed into another prime (21654001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10827020 + 10827021.

It is an arithmetic number, because the mean of its divisors is an integer number (10827021).

Almost surely, 2^21654041 is an apocalyptic number.

It is an amenable number.

21654041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21654041 is an equidigital number, since it uses as much as digits as its factorization.

21654041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 21654041 is about 4653.3902694702. The cubic root of 21654041 is about 278.7273922424.

Adding to 21654041 its reverse (14045612), we get a palindrome (35699653).

The spelling of 21654041 in words is "twenty-one million, six hundred fifty-four thousand, forty-one".