11211001211 has 4 divisors (see below), whose sum is σ = 11211548400. Its totient is φ = 11210454024.

The previous prime is 11211001201. The next prime is 11211001213. The reversal of 11211001211 is 11210011211.

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 11211001211 - 2³⁰ = 10137259387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211001192 and 11211001201.

It is not an unprimeable number, because it can be changed into a prime (11211001213) 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, 241616 + ... + 284253.

It is an arithmetic number, because the mean of its divisors is an integer number (2802887100).

Almost surely, 2^11211001211 is an apocalyptic number.

11211001211 is a deficient number, since it is larger than the sum of its proper divisors (547189).

11211001211 is an equidigital number, since it uses as much as digits as its factorization.

11211001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547188.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11211001211 its reverse (11210011211), we get a palindrome (22421012422).

The spelling of 11211001211 in words is "eleven billion, two hundred eleven million, one thousand, two hundred eleven".