21330020311 has 2 divisors, whose sum is σ = 21330020312. Its totient is φ = 21330020310.

The previous prime is 21330020287. The next prime is 21330020317. The reversal of 21330020311 is 11302003312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21330020311 - 2⁵ = 21330020279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330020317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665010155 + 10665010156.

It is an arithmetic number, because the mean of its divisors is an integer number (10665010156).

Almost surely, 2^21330020311 is an apocalyptic number.

21330020311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330020311 is an equidigital number, since it uses as much as digits as its factorization.

21330020311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21330020311 its reverse (11302003312), we get a palindrome (32632023623).

The spelling of 21330020311 in words is "twenty-one billion, three hundred thirty million, twenty thousand, three hundred eleven".