221310312211 has 8 divisors (see below), whose sum is σ = 234442036880. Its totient is φ = 208326968928.

The previous prime is 221310312191. The next prime is 221310312227. The reversal of 221310312211 is 112213013122.

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

It is a de Polignac number, because none of the positive numbers 2^k-221310312211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221310312281) 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, 37092276 + ... + 37098241.

It is an arithmetic number, because the mean of its divisors is an integer number (29305254610).

Almost surely, 2^221310312211 is an apocalyptic number.

221310312211 is a deficient number, since it is larger than the sum of its proper divisors (13131724669).

221310312211 is a wasteful number, since it uses less digits than its factorization.

221310312211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74190693.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 221310312211 its reverse (112213013122), we get a palindrome (333523325333).

The spelling of 221310312211 in words is "two hundred twenty-one billion, three hundred ten million, three hundred twelve thousand, two hundred eleven".