11112010221821 has 2 divisors, whose sum is σ = 11112010221822. Its totient is φ = 11112010221820.

The previous prime is 11112010221803. The next prime is 11112010221889. The reversal of 11112010221821 is 12812201021111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8126268136921 + 2985742084900 = 2850661^2 + 1727930^2 .

It is a cyclic number.

It is not a de Polignac number, because 11112010221821 - 2⁶ = 11112010221757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11112010221121) 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, 5556005110910 + 5556005110911.

It is an arithmetic number, because the mean of its divisors is an integer number (5556005110911).

Almost surely, 2^{11112010221821} is an apocalyptic number.

It is an amenable number.

11112010221821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112010221821 is an equidigital number, since it uses as much as digits as its factorization.

11112010221821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 23.

Adding to 11112010221821 its reverse (12812201021111), we get a palindrome (23924211242932).

The spelling of 11112010221821 in words is "eleven trillion, one hundred twelve billion, ten million, two hundred twenty-one thousand, eight hundred twenty-one".