221000212221 has 16 divisors (see below), whose sum is σ = 295142679936. Its totient is φ = 147095755776.

The previous prime is 221000212189. The next prime is 221000212229. The reversal of 221000212221 is 122212000122.

It is not a de Polignac number, because 221000212221 - 2⁵ = 221000212189 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221000212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000212229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6681901 + ... + 6714893.

It is an arithmetic number, because the mean of its divisors is an integer number (18446417496).

Almost surely, 2^221000212221 is an apocalyptic number.

It is an amenable number.

221000212221 is a deficient number, since it is larger than the sum of its proper divisors (74142467715).

221000212221 is a wasteful number, since it uses less digits than its factorization.

221000212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36532.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221000212221 its reverse (122212000122), we get a palindrome (343212212343).

The spelling of 221000212221 in words is "two hundred twenty-one billion, two hundred twelve thousand, two hundred twenty-one".