221310123302221 has 4 divisors (see below), whose sum is σ = 221440535869212. Its totient is φ = 221179710735232.

The previous prime is 221310123302209. The next prime is 221310123302291. The reversal of 221310123302221 is 122203321013122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125442800015625 + 95867323286596 = 11200125^2 + 9791186^2 .

It is a cyclic number.

It is not a de Polignac number, because 221310123302221 - 2¹⁷ = 221310123171149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221310123302201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65206280950 + ... + 65206284343.

It is an arithmetic number, because the mean of its divisors is an integer number (55360133967303).

Almost surely, 2^{221310123302221} is an apocalyptic number.

It is an amenable number.

221310123302221 is a deficient number, since it is larger than the sum of its proper divisors (130412566991).

221310123302221 is a wasteful number, since it uses less digits than its factorization.

221310123302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130412566990.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 221310123302221 its reverse (122203321013122), we get a palindrome (343513444315343).

The spelling of 221310123302221 in words is "two hundred twenty-one trillion, three hundred ten billion, one hundred twenty-three million, three hundred two thousand, two hundred twenty-one".