221980211 has 4 divisors (see below), whose sum is σ = 233663400. Its totient is φ = 210297024.

The previous prime is 221980207. The next prime is 221980261. The reversal of 221980211 is 112089122.

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 221980211 - 2² = 221980207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221980261) 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, 5841566 + ... + 5841603.

It is an arithmetic number, because the mean of its divisors is an integer number (58415850).

Almost surely, 2^221980211 is an apocalyptic number.

221980211 is a deficient number, since it is larger than the sum of its proper divisors (11683189).

221980211 is a wasteful number, since it uses less digits than its factorization.

221980211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11683188.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 221980211 is about 14899.0003355930. Note that the first 3 decimals coincide. The cubic root of 221980211 is about 605.4869026205.

The spelling of 221980211 in words is "two hundred twenty-one million, nine hundred eighty thousand, two hundred eleven".