11011211301821 has 2 divisors, whose sum is σ = 11011211301822. Its totient is φ = 11011211301820.

The previous prime is 11011211301799. The next prime is 11011211301869. The reversal of 11011211301821 is 12810311211011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8042272092100 + 2968939209721 = 2835890^2 + 1723061^2 .

It is an emirp because it is prime and its reverse (12810311211011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11011211301821 - 2⁶ = 11011211301757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11011211501821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505605650910 + 5505605650911.

It is an arithmetic number, because the mean of its divisors is an integer number (5505605650911).

Almost surely, 2^{11011211301821} is an apocalyptic number.

It is an amenable number.

11011211301821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011211301821 is an equidigital number, since it uses as much as digits as its factorization.

11011211301821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 23.

Adding to 11011211301821 its reverse (12810311211011), we get a palindrome (23821522512832).

The spelling of 11011211301821 in words is "eleven trillion, eleven billion, two hundred eleven million, three hundred one thousand, eight hundred twenty-one".