11212221211 has 4 divisors (see below), whose sum is σ = 11247591312. Its totient is φ = 11176851112.

The previous prime is 11212221197. The next prime is 11212221221.

11212221211 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 11212221211 - 2¹⁵ = 11212188443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11212221221) 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, 17684575 + ... + 17685208.

It is an arithmetic number, because the mean of its divisors is an integer number (2811897828).

Almost surely, 2^11212221211 is an apocalyptic number.

11212221211 is a deficient number, since it is larger than the sum of its proper divisors (35370101).

11212221211 is an equidigital number, since it uses as much as digits as its factorization.

11212221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35370100.

The product of its digits is 32, while the sum is 16.

The spelling of 11212221211 in words is "eleven billion, two hundred twelve million, two hundred twenty-one thousand, two hundred eleven".