221101221211 has 4 divisors (see below), whose sum is σ = 238109007472. Its totient is φ = 204093434952.

The previous prime is 221101221191. The next prime is 221101221227. The reversal of 221101221211 is 112122101122.

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 221101221211 - 2⁷ = 221101221083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221101221251) 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, 8503893111 + ... + 8503893136.

It is an arithmetic number, because the mean of its divisors is an integer number (59527251868).

Almost surely, 2^221101221211 is an apocalyptic number.

221101221211 is a deficient number, since it is larger than the sum of its proper divisors (17007786261).

221101221211 is a wasteful number, since it uses less digits than its factorization.

221101221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17007786260.

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

Adding to 221101221211 its reverse (112122101122), we get a palindrome (333223322333).

The spelling of 221101221211 in words is "two hundred twenty-one billion, one hundred one million, two hundred twenty-one thousand, two hundred eleven".