221111221212211 has 16 divisors (see below), whose sum is σ = 241312575702528. Its totient is φ = 200926593079200.

The previous prime is 221111221212209. The next prime is 221111221212227. The reversal of 221111221212211 is 112212122111122.

It is a cyclic number.

It is not a de Polignac number, because 221111221212211 - 2¹ = 221111221212209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221111221215211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1592228166 + ... + 1592367028.

It is an arithmetic number, because the mean of its divisors is an integer number (15082035981408).

Almost surely, 2^{221111221212211} is an apocalyptic number.

221111221212211 is a deficient number, since it is larger than the sum of its proper divisors (20201354490317).

221111221212211 is a wasteful number, since it uses less digits than its factorization.

221111221212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198042.

The product of its digits is 128, while the sum is 22.

Adding to 221111221212211 its reverse (112212122111122), we get a palindrome (333323343323333).

The spelling of 221111221212211 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, two hundred eleven".