221100013221 has 32 divisors (see below), whose sum is σ = 312824521728. Its totient is φ = 138661009920.

The previous prime is 221100013217. The next prime is 221100013229. The reversal of 221100013221 is 122310001122.

It is not a de Polignac number, because 221100013221 - 2² = 221100013217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221100013221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100013229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3745491 + ... + 3804063.

It is an arithmetic number, because the mean of its divisors is an integer number (9775766304).

Almost surely, 2^221100013221 is an apocalyptic number.

It is an amenable number.

221100013221 is a deficient number, since it is larger than the sum of its proper divisors (91724508507).

221100013221 is a wasteful number, since it uses less digits than its factorization.

221100013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59741.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221100013221 its reverse (122310001122), we get a palindrome (343410014343).

The spelling of 221100013221 in words is "two hundred twenty-one billion, one hundred million, thirteen thousand, two hundred twenty-one".