21212111093 has 2 divisors, whose sum is σ = 21212111094. Its totient is φ = 21212111092.

The previous prime is 21212111071. The next prime is 21212111101. The reversal of 21212111093 is 39011121212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18913675729 + 2298435364 = 137527^2 + 47942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212111093 - 2¹² = 21212106997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212111003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606055546 + 10606055547.

It is an arithmetic number, because the mean of its divisors is an integer number (10606055547).

Almost surely, 2^21212111093 is an apocalyptic number.

It is an amenable number.

21212111093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212111093 is an equidigital number, since it uses as much as digits as its factorization.

21212111093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 21212111093 in words is "twenty-one billion, two hundred twelve million, one hundred eleven thousand, ninety-three".