221111012211 has 8 divisors (see below), whose sum is σ = 302782647504. Its totient is φ = 143423359200.

The previous prime is 221111012149. The next prime is 221111012251. The reversal of 221111012211 is 112210111122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221111012211 - 2⁶ = 221111012147 is a prime.

It is a super-2 number, since 2×221111012211² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221111012251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 995995440 + ... + 995995661.

It is an arithmetic number, because the mean of its divisors is an integer number (37847830938).

Almost surely, 2^221111012211 is an apocalyptic number.

221111012211 is a deficient number, since it is larger than the sum of its proper divisors (81671635293).

221111012211 is a wasteful number, since it uses less digits than its factorization.

221111012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991991141.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221111012211 its reverse (112210111122), we get a palindrome (333321123333).

The spelling of 221111012211 in words is "two hundred twenty-one billion, one hundred eleven million, twelve thousand, two hundred eleven".