221220222211 has 4 divisors (see below), whose sum is σ = 221265072112. Its totient is φ = 221175372312.

The previous prime is 221220222161. The next prime is 221220222241. The reversal of 221220222211 is 112222022122.

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 221220222211 - 2²¹ = 221218125059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221220222241) 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, 22417551 + ... + 22427416.

It is an arithmetic number, because the mean of its divisors is an integer number (55316268028).

Almost surely, 2^221220222211 is an apocalyptic number.

221220222211 is a deficient number, since it is larger than the sum of its proper divisors (44849901).

221220222211 is an equidigital number, since it uses as much as digits as its factorization.

221220222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44849900.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221220222211 its reverse (112222022122), we get a palindrome (333442244333).

The spelling of 221220222211 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred eleven".