11211021211 has 4 divisors (see below), whose sum is σ = 12073407472. Its totient is φ = 10348634952.

The previous prime is 11211021187. The next prime is 11211021247. The reversal of 11211021211 is 11212011211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11211021211 - 2⁵ = 11211021179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 862386247 = 11211021211 / (1 + 1 + 2 + 1 + 1 + 0 + 2 + 1 + 2 + 1 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211021191 and 11211021200.

It is not an unprimeable number, because it can be changed into a prime (11211021911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431193111 + ... + 431193136.

It is an arithmetic number, because the mean of its divisors is an integer number (3018351868).

Almost surely, 2^11211021211 is an apocalyptic number.

11211021211 is a deficient number, since it is larger than the sum of its proper divisors (862386261).

11211021211 is an equidigital number, since it uses as much as digits as its factorization.

11211021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862386260.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11211021211 its reverse (11212011211), we get a palindrome (22423032422).

The spelling of 11211021211 in words is "eleven billion, two hundred eleven million, twenty-one thousand, two hundred eleven".