11211121441 has 4 divisors (see below), whose sum is σ = 12073515412. Its totient is φ = 10348727472.

The previous prime is 11211121381. The next prime is 11211121459. The reversal of 11211121441 is 14412111211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2284840000 + 8926281441 = 47800^2 + 94479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211121441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211125441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431196966 + ... + 431196991.

It is an arithmetic number, because the mean of its divisors is an integer number (3018378853).

Almost surely, 2^11211121441 is an apocalyptic number.

It is an amenable number.

11211121441 is a deficient number, since it is larger than the sum of its proper divisors (862393971).

11211121441 is an equidigital number, since it uses as much as digits as its factorization.

11211121441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862393970.

The product of its digits is 64, while the sum is 19.

Adding to 11211121441 its reverse (14412111211), we get a palindrome (25623232652).

The spelling of 11211121441 in words is "eleven billion, two hundred eleven million, one hundred twenty-one thousand, four hundred forty-one".