221011212211 has 8 divisors (see below), whose sum is σ = 226447192944. Its totient is φ = 215577396480.

The previous prime is 221011212209. The next prime is 221011212221. The reversal of 221011212211 is 112212110122.

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

It is not a de Polignac number, because 221011212211 - 2¹ = 221011212209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221011212221) 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, 333606 + ... + 743851.

It is an arithmetic number, because the mean of its divisors is an integer number (28305899118).

Almost surely, 2^221011212211 is an apocalyptic number.

221011212211 is a deficient number, since it is larger than the sum of its proper divisors (5435980733).

221011212211 is a wasteful number, since it uses less digits than its factorization.

221011212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082501.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221011212211 its reverse (112212110122), we get a palindrome (333223322333).

The spelling of 221011212211 in words is "two hundred twenty-one billion, eleven million, two hundred twelve thousand, two hundred eleven".