21104011 has 2 divisors, whose sum is σ = 21104012. Its totient is φ = 21104010.

The previous prime is 21103961. The next prime is 21104029. The reversal of 21104011 is 11040112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21104011 - 2⁷ = 21103883 is a prime.

It is not a weakly prime, because it can be changed into another prime (21104071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10552005 + 10552006.

It is an arithmetic number, because the mean of its divisors is an integer number (10552006).

Almost surely, 2^21104011 is an apocalyptic number.

21104011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21104011 is an equidigital number, since it uses as much as digits as its factorization.

21104011 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21104011 is about 4593.9102080907. The cubic root of 21104011 is about 276.3471573246.

Adding to 21104011 its reverse (11040112), we get a palindrome (32144123).

It can be divided in two parts, 2 and 1104011, that multiplied together give a palindrome (2208022).

The spelling of 21104011 in words is "twenty-one million, one hundred four thousand, eleven".