11221011211 has 4 divisors (see below), whose sum is σ = 11881070712. Its totient is φ = 10560951712.

The previous prime is 11221011169. The next prime is 11221011233. The reversal of 11221011211 is 11211012211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11211012211 = 7 ⋅1601573173.

It is a cyclic number.

It is not a de Polignac number, because 11221011211 - 2¹⁵ = 11220978443 is a prime.

It is a super-2 number, since 2×11221011211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221011191 and 11221011200.

It is not an unprimeable number, because it can be changed into a prime (11221011911) 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, 330029725 + ... + 330029758.

It is an arithmetic number, because the mean of its divisors is an integer number (2970267678).

Almost surely, 2^11221011211 is an apocalyptic number.

11221011211 is a deficient number, since it is larger than the sum of its proper divisors (660059501).

11221011211 is an equidigital number, since it uses as much as digits as its factorization.

11221011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660059500.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11221011211 its reverse (11211012211), we get a palindrome (22432023422).

The spelling of 11221011211 in words is "eleven billion, two hundred twenty-one million, eleven thousand, two hundred eleven".