221022221121 has 48 divisors (see below), whose sum is σ = 355618204032. Its totient is φ = 131407660800.

The previous prime is 221022221099. The next prime is 221022221131. The reversal of 221022221121 is 121122220122.

It is a happy number.

221022221121 is a `hidden beast` number, since 2 + 210 + 222 + 211 + 21 = 666.

It is not a de Polignac number, because 221022221121 - 2⁹ = 221022220609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221022221094 and 221022221103.

It is not an unprimeable number, because it can be changed into a prime (221022221131) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 270426 + ... + 717756.

It is an arithmetic number, because the mean of its divisors is an integer number (7408712584).

Almost surely, 2^221022221121 is an apocalyptic number.

It is an amenable number.

221022221121 is a deficient number, since it is larger than the sum of its proper divisors (134595982911).

221022221121 is a wasteful number, since it uses less digits than its factorization.

221022221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447494 (or 447491 counting only the distinct ones).

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

Adding to 221022221121 its reverse (121122220122), we get a palindrome (342144441243).

Subtracting from 221022221121 its reverse (121122220122), we obtain a palindrome (99900000999).

The spelling of 221022221121 in words is "two hundred twenty-one billion, twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".