221220112011 has 4 divisors (see below), whose sum is σ = 294960149352. Its totient is φ = 147480074672.

The previous prime is 221220111979. The next prime is 221220112037. The reversal of 221220112011 is 110211022122.

221220112011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221220112011 - 2⁵ = 221220111979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221220119011) 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, 36870018666 + ... + 36870018671.

It is an arithmetic number, because the mean of its divisors is an integer number (73740037338).

Almost surely, 2^221220112011 is an apocalyptic number.

221220112011 is a deficient number, since it is larger than the sum of its proper divisors (73740037341).

221220112011 is an equidigital number, since it uses as much as digits as its factorization.

221220112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73740037340.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221220112011 its reverse (110211022122), we get a palindrome (331431134133).

The spelling of 221220112011 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twelve thousand, eleven".