21041011 has 2 divisors, whose sum is σ = 21041012. Its totient is φ = 21041010.

The previous prime is 21040997. The next prime is 21041029. The reversal of 21041011 is 11014012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21041011 - 2⁹ = 21040499 is a prime.

It is not a weakly prime, because it can be changed into another prime (21041071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520505 + 10520506.

It is an arithmetic number, because the mean of its divisors is an integer number (10520506).

Almost surely, 2^21041011 is an apocalyptic number.

21041011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041011 is an equidigital number, since it uses as much as digits as its factorization.

21041011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 21041011 is about 4587.0481793851. The cubic root of 21041011 is about 276.0718980581.

Adding to 21041011 its reverse (11014012), we get a palindrome (32055023).

The spelling of 21041011 in words is "twenty-one million, forty-one thousand, eleven".