221110011211 has 4 divisors (see below), whose sum is σ = 222797874024. Its totient is φ = 219422148400.

The previous prime is 221110011203. The next prime is 221110011229. The reversal of 221110011211 is 112110011122.

It is a happy number.

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 221110011211 - 2³ = 221110011203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221110011191 and 221110011200.

It is not an unprimeable number, because it can be changed into a prime (221110011271) 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, 843931210 + ... + 843931471.

It is an arithmetic number, because the mean of its divisors is an integer number (55699468506).

Almost surely, 2^221110011211 is an apocalyptic number.

221110011211 is a deficient number, since it is larger than the sum of its proper divisors (1687862813).

221110011211 is a wasteful number, since it uses less digits than its factorization.

221110011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687862812.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221110011211 its reverse (112110011122), we get a palindrome (333220022333).

The spelling of 221110011211 in words is "two hundred twenty-one billion, one hundred ten million, eleven thousand, two hundred eleven".