221122020121 has 16 divisors (see below), whose sum is σ = 240469235200. Its totient is φ = 202557024000.

The previous prime is 221122020113. The next prime is 221122020149. The reversal of 221122020121 is 121020221122.

It is a happy number.

It is not a de Polignac number, because 221122020121 - 2³ = 221122020113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221122020095 and 221122020104.

It is not an unprimeable number, because it can be changed into a prime (221122024121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 551095 + ... + 863683.

It is an arithmetic number, because the mean of its divisors is an integer number (15029327200).

Almost surely, 2^221122020121 is an apocalyptic number.

It is an amenable number.

221122020121 is a deficient number, since it is larger than the sum of its proper divisors (19347215079).

221122020121 is a wasteful number, since it uses less digits than its factorization.

221122020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313840.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221122020121 its reverse (121020221122), we get a palindrome (342142241243).

The spelling of 221122020121 in words is "two hundred twenty-one billion, one hundred twenty-two million, twenty thousand, one hundred twenty-one".