11221212011 has 4 divisors (see below), whose sum is σ = 11583186624. Its totient is φ = 10859237400.

The previous prime is 11221212007. The next prime is 11221212019. The reversal of 11221212011 is 11021212211.

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 11221212011 - 2² = 11221212007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11221212019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180987260 + ... + 180987321.

It is an arithmetic number, because the mean of its divisors is an integer number (2895796656).

Almost surely, 2^11221212011 is an apocalyptic number.

11221212011 is a deficient number, since it is larger than the sum of its proper divisors (361974613).

11221212011 is an equidigital number, since it uses as much as digits as its factorization.

11221212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361974612.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11221212011 its reverse (11021212211), we get a palindrome (22242424222).

The spelling of 11221212011 in words is "eleven billion, two hundred twenty-one million, two hundred twelve thousand, eleven".