11011211211001 has 4 divisors (see below), whose sum is σ = 11011233186432. Its totient is φ = 11011189235572.

The previous prime is 11011211210999. The next prime is 11011211211031. The reversal of 11011211211001 is 10011211211011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11011211211001 - 2¹ = 11011211210999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11011211211031) 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 in 3 ways as a sum of consecutive naturals, for example, 10218145 + ... + 11244238.

It is an arithmetic number, because the mean of its divisors is an integer number (2752808296608).

Almost surely, 2^{11011211211001} is an apocalyptic number.

It is an amenable number.

11011211211001 is a deficient number, since it is larger than the sum of its proper divisors (21975431).

11011211211001 is an equidigital number, since it uses as much as digits as its factorization.

11011211211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21975430.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 11011211211001 its reverse (10011211211011), we get a palindrome (21022422422012).

The spelling of 11011211211001 in words is "eleven trillion, eleven billion, two hundred eleven million, two hundred eleven thousand, one".