21404330111 has 2 divisors, whose sum is σ = 21404330112. Its totient is φ = 21404330110.

The previous prime is 21404330093. The next prime is 21404330257. The reversal of 21404330111 is 11103340412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21404330111 - 2³⁴ = 4224460927 is a prime.

It is a super-2 number, since 2×21404330111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404330011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702165055 + 10702165056.

It is an arithmetic number, because the mean of its divisors is an integer number (10702165056).

Almost surely, 2^21404330111 is an apocalyptic number.

21404330111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404330111 is an equidigital number, since it uses as much as digits as its factorization.

21404330111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21404330111 its reverse (11103340412), we get a palindrome (32507670523).

The spelling of 21404330111 in words is "twenty-one billion, four hundred four million, three hundred thirty thousand, one hundred eleven".