221001100102221 has 16 divisors (see below), whose sum is σ = 294907657800000. Its totient is φ = 147214307455488.

The previous prime is 221001100102187. The next prime is 221001100102309. The reversal of 221001100102221 is 122201001100122.

It is not a de Polignac number, because 221001100102221 - 2¹¹ = 221001100100173 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 221001100102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001100102621) 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 15 ways as a sum of consecutive naturals, for example, 352725595 + ... + 353351591.

It is an arithmetic number, because the mean of its divisors is an integer number (18431728612500).

Almost surely, 2^{221001100102221} is an apocalyptic number.

It is an amenable number.

221001100102221 is a deficient number, since it is larger than the sum of its proper divisors (73906557697779).

221001100102221 is a wasteful number, since it uses less digits than its factorization.

221001100102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721468.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221001100102221 its reverse (122201001100122), we get a palindrome (343202101202343).

The spelling of 221001100102221 in words is "two hundred twenty-one trillion, one billion, one hundred million, one hundred two thousand, two hundred twenty-one".