221100212200221 has 24 divisors (see below), whose sum is σ = 321913869653376. Its totient is φ = 146225412889920.

The previous prime is 221100212200201. The next prime is 221100212200277. The reversal of 221100212200221 is 122002212001122.

It is a happy number.

221100212200221 is a `hidden beast` number, since 2 + 21 + 10 + 0 + 212 + 200 + 221 = 666.

It is not a de Polignac number, because 221100212200221 - 2³⁹ = 220550456386333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221100212200194 and 221100212200203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100212200201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28271205 + ... + 35234378.

It is an arithmetic number, because the mean of its divisors is an integer number (13413077902224).

Almost surely, 2^{221100212200221} is an apocalyptic number.

It is an amenable number.

221100212200221 is a deficient number, since it is larger than the sum of its proper divisors (100813657453155).

221100212200221 is a wasteful number, since it uses less digits than its factorization.

221100212200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63508673 (or 63508670 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221100212200221 its reverse (122002212001122), we get a palindrome (343102424201343).

The spelling of 221100212200221 in words is "two hundred twenty-one trillion, one hundred billion, two hundred twelve million, two hundred thousand, two hundred twenty-one".