221100020011221 has 32 divisors (see below), whose sum is σ = 318252580719360. Its totient is φ = 135729182131200.

The previous prime is 221100020011097. The next prime is 221100020011223. The reversal of 221100020011221 is 122110020001122.

It is not a de Polignac number, because 221100020011221 - 2²² = 221100015816917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221100020011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100020011223) 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, 246346045 + ... + 247241933.

It is an arithmetic number, because the mean of its divisors is an integer number (9945393147480).

Almost surely, 2^{221100020011221} is an apocalyptic number.

It is an amenable number.

221100020011221 is a deficient number, since it is larger than the sum of its proper divisors (97152560708139).

221100020011221 is a wasteful number, since it uses less digits than its factorization.

221100020011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911357.

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

Adding to 221100020011221 its reverse (122110020001122), we get a palindrome (343210040012343).

The spelling of 221100020011221 in words is "two hundred twenty-one trillion, one hundred billion, twenty million, eleven thousand, two hundred twenty-one".