221222221011 has 20 divisors (see below), whose sum is σ = 360510287544. Its totient is φ = 134074072800.

The previous prime is 221222220977. The next prime is 221222221027. The reversal of 221222221011 is 110122222122.

It is a happy number.

221222221011 is a `hidden beast` number, since 221 + 2 + 222 + 210 + 11 = 666.

It is not a de Polignac number, because 221222221011 - 2¹⁷ = 221222089939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221222221061) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 124141770 + ... + 124143551.

Almost surely, 2^221222221011 is an apocalyptic number.

221222221011 is a deficient number, since it is larger than the sum of its proper divisors (139288066533).

221222221011 is a wasteful number, since it uses less digits than its factorization.

221222221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248285344 (or 248285335 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221222221011 its reverse (110122222122), we get a palindrome (331344443133).

The spelling of 221222221011 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, eleven".