21404330011 has 2 divisors, whose sum is σ = 21404330012. Its totient is φ = 21404330010.

The previous prime is 21404330009. The next prime is 21404330021. The reversal of 21404330011 is 11003340412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21404330011 - 2¹ = 21404330009 is a prime.

Together with 21404330009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21404330021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702165005 + 10702165006.

It is an arithmetic number, because the mean of its divisors is an integer number (10702165006).

Almost surely, 2^21404330011 is an apocalyptic number.

21404330011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404330011 is an equidigital number, since it uses as much as digits as its factorization.

21404330011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21404330011 its reverse (11003340412), we get a palindrome (32407670423).

The spelling of 21404330011 in words is "twenty-one billion, four hundred four million, three hundred thirty thousand, eleven".