221120222121 has 24 divisors (see below), whose sum is σ = 337366405376. Its totient is φ = 139340567520.

The previous prime is 221120222117. The next prime is 221120222153. The reversal of 221120222121 is 121222021122.

It is a happy number.

221120222121 is a `hidden beast` number, since 221 + 1 + 202 + 221 + 21 = 666.

It is not a de Polignac number, because 221120222121 - 2² = 221120222117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221120222094 and 221120222103.

It is not an unprimeable number, because it can be changed into a prime (221120222101) 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 23 ways as a sum of consecutive naturals, for example, 9203650 + ... + 9227643.

Almost surely, 2^221120222121 is an apocalyptic number.

It is an amenable number.

221120222121 is a deficient number, since it is larger than the sum of its proper divisors (116246183255).

221120222121 is a wasteful number, since it uses less digits than its factorization.

221120222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18431373 (or 18431370 counting only the distinct ones).

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

Adding to 221120222121 its reverse (121222021122), we get a palindrome (342342243243).

The spelling of 221120222121 in words is "two hundred twenty-one billion, one hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".