221120222021121 has 4 divisors (see below), whose sum is σ = 294826962694832. Its totient is φ = 147413481347412.

The previous prime is 221120222021093. The next prime is 221120222021123. The reversal of 221120222021121 is 121120222021122.

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 not a de Polignac number, because 221120222021121 - 2⁵ = 221120222021089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221120222021123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36853370336851 + ... + 36853370336856.

It is an arithmetic number, because the mean of its divisors is an integer number (73706740673708).

Almost surely, 2^{221120222021121} is an apocalyptic number.

It is an amenable number.

221120222021121 is a deficient number, since it is larger than the sum of its proper divisors (73706740673711).

221120222021121 is an equidigital number, since it uses as much as digits as its factorization.

221120222021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73706740673710.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221120222021121 its reverse (121120222021122), we get a palindrome (342240444042243).

Subtracting from 221120222021121 its reverse (121120222021122), we obtain a palindrome (99999999999999).

The spelling of 221120222021121 in words is "two hundred twenty-one trillion, one hundred twenty billion, two hundred twenty-two million, twenty-one thousand, one hundred twenty-one".