221980611 has 12 divisors (see below), whose sum is σ = 314409752. Its totient is φ = 139281408.

The previous prime is 221980607. The next prime is 221980621. The reversal of 221980611 is 116089122.

It is a happy number.

It is not a de Polignac number, because 221980611 - 2² = 221980607 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221980621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127150 + ... + 128883.

Almost surely, 2^221980611 is an apocalyptic number.

221980611 is a deficient number, since it is larger than the sum of its proper divisors (92429141).

221980611 is a wasteful number, since it uses less digits than its factorization.

221980611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256070 (or 256053 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 221980611 is about 14899.0137593064. The cubic root of 221980611 is about 605.4872663085.

The spelling of 221980611 in words is "two hundred twenty-one million, nine hundred eighty thousand, six hundred eleven".