221221222101 has 48 divisors (see below), whose sum is σ = 358483320000. Its totient is φ = 130319819520.

The previous prime is 221221222091. The next prime is 221221222147. The reversal of 221221222101 is 101222122122.

It is a happy number.

221221222101 is a `hidden beast` number, since 221 + 221 + 2 + 221 + 0 + 1 = 666.

It is not a de Polignac number, because 221221222101 - 2¹⁵ = 221221189333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221222151) 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 47 ways as a sum of consecutive naturals, for example, 307075 + ... + 732623.

It is an arithmetic number, because the mean of its divisors is an integer number (7468402500).

Almost surely, 2^221221222101 is an apocalyptic number.

It is an amenable number.

221221222101 is a deficient number, since it is larger than the sum of its proper divisors (137262097899).

221221222101 is a wasteful number, since it uses less digits than its factorization.

221221222101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425714 (or 425711 counting only the distinct ones).

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

Adding to 221221222101 its reverse (101222122122), we get a palindrome (322443344223).

The spelling of 221221222101 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred one".