21330001111 has 2 divisors, whose sum is σ = 21330001112. Its totient is φ = 21330001110.

The previous prime is 21330001097. The next prime is 21330001123. The reversal of 21330001111 is 11110003312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21330001111 - 2⁷ = 21330000983 is a prime.

It is a super-2 number, since 2×21330001111² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21330001091 and 21330001100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330001411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665000555 + 10665000556.

It is an arithmetic number, because the mean of its divisors is an integer number (10665000556).

Almost surely, 2^21330001111 is an apocalyptic number.

21330001111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330001111 is an equidigital number, since it uses as much as digits as its factorization.

21330001111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21330001111 its reverse (11110003312), we get a palindrome (32440004423).

The spelling of 21330001111 in words is "twenty-one billion, three hundred thirty million, one thousand, one hundred eleven".