221220001111211 has 4 divisors (see below), whose sum is σ = 221225579203800. Its totient is φ = 221214423018624.

The previous prime is 221220001111177. The next prime is 221220001111253. The reversal of 221220001111211 is 112111100022122.

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 221220001111211 - 2³⁰ = 221218927369387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221220001111211.

It is not an unprimeable number, because it can be changed into a prime (221220001111511) 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, 2788986806 + ... + 2789066123.

It is an arithmetic number, because the mean of its divisors is an integer number (55306394800950).

Almost surely, 2^{221220001111211} is an apocalyptic number.

221220001111211 is a deficient number, since it is larger than the sum of its proper divisors (5578092589).

221220001111211 is an equidigital number, since it uses as much as digits as its factorization.

221220001111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5578092588.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221220001111211 its reverse (112111100022122), we get a palindrome (333331101133333).

The spelling of 221220001111211 in words is "two hundred twenty-one trillion, two hundred twenty billion, one million, one hundred eleven thousand, two hundred eleven".