221221220011 has 8 divisors (see below), whose sum is σ = 242475997248. Its totient is φ = 200157069000.

The previous prime is 221221219987. The next prime is 221221220021. The reversal of 221221220011 is 110022122122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221221220011 - 2⁵ = 221221219979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221221220021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47654125 + ... + 47658766.

It is an arithmetic number, because the mean of its divisors is an integer number (30309499656).

Almost surely, 2^221221220011 is an apocalyptic number.

221221220011 is a deficient number, since it is larger than the sum of its proper divisors (21254777237).

221221220011 is a wasteful number, since it uses less digits than its factorization.

221221220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95313113.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221221220011 its reverse (110022122122), we get a palindrome (331243342133).

The spelling of 221221220011 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty thousand, eleven".