216221024144101 has 4 divisors (see below), whose sum is σ = 216833548292172. Its totient is φ = 215608499996032.

The previous prime is 216221024144071. The next prime is 216221024144173. The reversal of 216221024144101 is 101441420122612.

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 176894655030625 + 39326369113476 = 13300175^2 + 6271074^2 .

It is a cyclic number.

It is not a de Polignac number, because 216221024144101 - 2³³ = 216212434209509 is a prime.

It is a super-2 number, since 2×216221024144101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216221024144501) 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, 306262073506 + ... + 306262074211.

It is an arithmetic number, because the mean of its divisors is an integer number (54208387073043).

Almost surely, 2^{216221024144101} is an apocalyptic number.

It is an amenable number.

216221024144101 is a deficient number, since it is larger than the sum of its proper divisors (612524148071).

216221024144101 is an equidigital number, since it uses as much as digits as its factorization.

216221024144101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612524148070.

The product of its (nonzero) digits is 6144, while the sum is 31.

Adding to 216221024144101 its reverse (101441420122612), we get a palindrome (317662444266713).

The spelling of 216221024144101 in words is "two hundred sixteen trillion, two hundred twenty-one billion, twenty-four million, one hundred forty-four thousand, one hundred one".