21094791911 has 2 divisors, whose sum is σ = 21094791912. Its totient is φ = 21094791910.

The previous prime is 21094791881. The next prime is 21094791917. The reversal of 21094791911 is 11919749012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21094791911 - 2¹⁸ = 21094529767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21094791917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547395955 + 10547395956.

It is an arithmetic number, because the mean of its divisors is an integer number (10547395956).

Almost surely, 2^21094791911 is an apocalyptic number.

21094791911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21094791911 is an equidigital number, since it uses as much as digits as its factorization.

21094791911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 21094791911 in words is "twenty-one billion, ninety-four million, seven hundred ninety-one thousand, nine hundred eleven".