221202221121 has 12 divisors (see below), whose sum is σ = 365159222272. Its totient is φ = 126401269176.

The previous prime is 221202221117. The next prime is 221202221129. The reversal of 221202221121 is 121122202122.

It is a happy number.

221202221121 is a `hidden beast` number, since 221 + 202 + 221 + 1 + 21 = 666.

It is not a de Polignac number, because 221202221121 - 2² = 221202221117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221202221094 and 221202221103.

It is not an unprimeable number, because it can be changed into a prime (221202221129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1755573121 + ... + 1755573246.

Almost surely, 2^221202221121 is an apocalyptic number.

221202221121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221202221121 is a deficient number, since it is larger than the sum of its proper divisors (143957001151).

221202221121 is a wasteful number, since it uses less digits than its factorization.

221202221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3511146380 (or 3511146377 counting only the distinct ones).

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

Adding to 221202221121 its reverse (121122202122), we get a palindrome (342324423243).

The spelling of 221202221121 in words is "two hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, one hundred twenty-one".