221100211211 has 16 divisors (see below), whose sum is σ = 252060830208. Its totient is φ = 192148605600.

The previous prime is 221100211193. The next prime is 221100211217. The reversal of 221100211211 is 112112001122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221100211211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221100211217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4950560 + ... + 4995021.

It is an arithmetic number, because the mean of its divisors is an integer number (15753801888).

Almost surely, 2^221100211211 is an apocalyptic number.

221100211211 is a deficient number, since it is larger than the sum of its proper divisors (30960618997).

221100211211 is a wasteful number, since it uses less digits than its factorization.

221100211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9945682.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221100211211 its reverse (112112001122), we get a palindrome (333212212333).

The spelling of 221100211211 in words is "two hundred twenty-one billion, one hundred million, two hundred eleven thousand, two hundred eleven".