21111003311087 has 2 divisors, whose sum is σ = 21111003311088. Its totient is φ = 21111003311086.

The previous prime is 21111003311081. The next prime is 21111003311129. The reversal of 21111003311087 is 78011330011112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111003311087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111003311081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555501655543 + 10555501655544.

It is an arithmetic number, because the mean of its divisors is an integer number (10555501655544).

Almost surely, 2^{21111003311087} is an apocalyptic number.

21111003311087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111003311087 is an equidigital number, since it uses as much as digits as its factorization.

21111003311087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

Adding to 21111003311087 its reverse (78011330011112), we get a palindrome (99122333322199).

The spelling of 21111003311087 in words is "twenty-one trillion, one hundred eleven billion, three million, three hundred eleven thousand, eighty-seven".