221000220210221 has 4 divisors (see below), whose sum is σ = 221012770640700. Its totient is φ = 220987669779744.

The previous prime is 221000220210149. The next prime is 221000220210271. The reversal of 221000220210221 is 122012022000122.

It is a happy number.

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 200771499616996 + 20228720593225 = 14169386^2 + 4497635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221000220210221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221000220210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000220210271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6275188826 + ... + 6275224043.

It is an arithmetic number, because the mean of its divisors is an integer number (55253192660175).

Almost surely, 2^{221000220210221} is an apocalyptic number.

It is an amenable number.

221000220210221 is a deficient number, since it is larger than the sum of its proper divisors (12550430479).

221000220210221 is a wasteful number, since it uses less digits than its factorization.

221000220210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12550430478.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221000220210221 its reverse (122012022000122), we get a palindrome (343012242210343).

The spelling of 221000220210221 in words is "two hundred twenty-one trillion, two hundred twenty million, two hundred ten thousand, two hundred twenty-one".