11221211211 has 32 divisors (see below), whose sum is σ = 17207562240. Its totient is φ = 6371492736.

The previous prime is 11221211171. The next prime is 11221211219. The reversal of 11221211211 is 11211212211.

It is a happy number.

It is not a de Polignac number, because 11221211211 - 2⁶ = 11221211147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11221211219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5083270 + ... + 5085476.

It is an arithmetic number, because the mean of its divisors is an integer number (537736320).

Almost surely, 2^11221211211 is an apocalyptic number.

11221211211 is a deficient number, since it is larger than the sum of its proper divisors (5986351029).

11221211211 is a wasteful number, since it uses less digits than its factorization.

11221211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3643.

The product of its digits is 16, while the sum is 15.

Adding to 11221211211 its reverse (11211212211), we get a palindrome (22432423422).

It can be divided in two parts, 1122121 and 1211, that multiplied together give a palindrome (1358888531).

The spelling of 11221211211 in words is "eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred eleven".