221221002211 has 16 divisors (see below), whose sum is σ = 243593095680. Its totient is φ = 199226472480.

The previous prime is 221221002199. The next prime is 221221002221. The reversal of 221221002211 is 112200122122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221221002211 - 2¹¹ = 221221000163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221221002221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7523440 + ... + 7552786.

It is an arithmetic number, because the mean of its divisors is an integer number (15224568480).

Almost surely, 2^221221002211 is an apocalyptic number.

221221002211 is a deficient number, since it is larger than the sum of its proper divisors (22372093469).

221221002211 is a wasteful number, since it uses less digits than its factorization.

221221002211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35754.

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

Adding to 221221002211 its reverse (112200122122), we get a palindrome (333421124333).

The spelling of 221221002211 in words is "two hundred twenty-one billion, two hundred twenty-one million, two thousand, two hundred eleven".