221100212221211 has 4 divisors (see below), whose sum is σ = 221522965973592. Its totient is φ = 220677458468832.

The previous prime is 221100212221177. The next prime is 221100212221243. The reversal of 221100212221211 is 112122212001122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221100212221211 - 2¹⁴ = 221100212204827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221100212221111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211376875406 + ... + 211376876451.

It is an arithmetic number, because the mean of its divisors is an integer number (55380741493398).

Almost surely, 2^{221100212221211} is an apocalyptic number.

221100212221211 is a deficient number, since it is larger than the sum of its proper divisors (422753752381).

221100212221211 is an equidigital number, since it uses as much as digits as its factorization.

221100212221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422753752380.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221100212221211 its reverse (112122212001122), we get a palindrome (333222424222333).

The spelling of 221100212221211 in words is "two hundred twenty-one trillion, one hundred billion, two hundred twelve million, two hundred twenty-one thousand, two hundred eleven".