221103212121 has 24 divisors (see below), whose sum is σ = 348457633056. Its totient is φ = 133981727040.

The previous prime is 221103212119. The next prime is 221103212137. The reversal of 221103212121 is 121212301122.

221103212121 is a `hidden beast` number, since 22 + 110 + 321 + 212 + 1 = 666.

It is not a de Polignac number, because 221103212121 - 2¹ = 221103212119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221103212094 and 221103212103.

It is not an unprimeable number, because it can be changed into a prime (221103212191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 504421 + ... + 834653.

It is an arithmetic number, because the mean of its divisors is an integer number (14519068044).

Almost surely, 2^221103212121 is an apocalyptic number.

It is an amenable number.

221103212121 is a deficient number, since it is larger than the sum of its proper divisors (127354420935).

221103212121 is a wasteful number, since it uses less digits than its factorization.

221103212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337013 (or 337010 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221103212121 its reverse (121212301122), we get a palindrome (342315513243).

The spelling of 221103212121 in words is "two hundred twenty-one billion, one hundred three million, two hundred twelve thousand, one hundred twenty-one".