11311021211 has 4 divisors (see below), whose sum is σ = 12926881392. Its totient is φ = 9695161032.

The previous prime is 11311021199. The next prime is 11311021231. The reversal of 11311021211 is 11212011311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11212011311 = 197 ⋅56913763.

It is a cyclic number.

It is not a de Polignac number, because 11311021211 - 2¹⁰ = 11311020187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11311021231) 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, 807930080 + ... + 807930093.

It is an arithmetic number, because the mean of its divisors is an integer number (3231720348).

Almost surely, 2^11311021211 is an apocalyptic number.

11311021211 is a deficient number, since it is larger than the sum of its proper divisors (1615860181).

11311021211 is an equidigital number, since it uses as much as digits as its factorization.

11311021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615860180.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 11311021211 its reverse (11212011311), we get a palindrome (22523032522).

The spelling of 11311021211 in words is "eleven billion, three hundred eleven million, twenty-one thousand, two hundred eleven".