221022120121 has 4 divisors (see below), whose sum is σ = 241115040144. Its totient is φ = 200929200100.

The previous prime is 221022120091. The next prime is 221022120133. The reversal of 221022120121 is 121021220122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221022120121 - 2¹⁵ = 221022087353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221022120095 and 221022120104.

It is not an unprimeable number, because it can be changed into a prime (221022120161) 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 3 ways as a sum of consecutive naturals, for example, 10046459995 + ... + 10046460016.

It is an arithmetic number, because the mean of its divisors is an integer number (60278760036).

Almost surely, 2^221022120121 is an apocalyptic number.

It is an amenable number.

221022120121 is a deficient number, since it is larger than the sum of its proper divisors (20092920023).

221022120121 is a wasteful number, since it uses less digits than its factorization.

221022120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20092920022.

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

Adding to 221022120121 its reverse (121021220122), we get a palindrome (342043340243).

It can be divided in two parts, 221022 and 120121, that added together give a palindrome (341143).

The spelling of 221022120121 in words is "two hundred twenty-one billion, twenty-two million, one hundred twenty thousand, one hundred twenty-one".