221541216230065 has 8 divisors (see below), whose sum is σ = 266326747557480. Its totient is φ = 176914780929792.

The previous prime is 221541216230063. The next prime is 221541216230119. The reversal of 221541216230065 is 560032612145122.

It can be written as a sum of positive squares in 4 ways, for example, as 13542488320144 + 207998727909921 = 3680012^2 + 14422161^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221541216230065 - 2¹ = 221541216230063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221541216230063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39774003720 + ... + 39774009289.

It is an arithmetic number, because the mean of its divisors is an integer number (33290843444685).

Almost surely, 2^{221541216230065} is an apocalyptic number.

It is an amenable number.

221541216230065 is a deficient number, since it is larger than the sum of its proper divisors (44785531327415).

221541216230065 is an equidigital number, since it uses as much as digits as its factorization.

221541216230065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79548013571.

The product of its (nonzero) digits is 172800, while the sum is 40.

Adding to 221541216230065 its reverse (560032612145122), we get a palindrome (781573828375187).

The spelling of 221541216230065 in words is "two hundred twenty-one trillion, five hundred forty-one billion, two hundred sixteen million, two hundred thirty thousand, sixty-five".