21035313811 has 2 divisors, whose sum is σ = 21035313812. Its totient is φ = 21035313810.

The previous prime is 21035313791. The next prime is 21035313833. The reversal of 21035313811 is 11831353012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21035313811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21035313811.

It is not a weakly prime, because it can be changed into another prime (21035310811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10517656905 + 10517656906.

It is an arithmetic number, because the mean of its divisors is an integer number (10517656906).

Almost surely, 2^21035313811 is an apocalyptic number.

21035313811 is a deficient number, since it is larger than the sum of its proper divisors (1).

21035313811 is an equidigital number, since it uses as much as digits as its factorization.

21035313811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

Adding to 21035313811 its reverse (11831353012), we get a palindrome (32866666823).

The spelling of 21035313811 in words is "twenty-one billion, thirty-five million, three hundred thirteen thousand, eight hundred eleven".