221230312211 has 4 divisors (see below), whose sum is σ = 221277157992. Its totient is φ = 221183466432.

The previous prime is 221230312201. The next prime is 221230312213. The reversal of 221230312211 is 112213032122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112213032122 = 2 ⋅56106516061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221230312211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221230312213) 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, 23415806 + ... + 23425251.

It is an arithmetic number, because the mean of its divisors is an integer number (55319289498).

Almost surely, 2^221230312211 is an apocalyptic number.

221230312211 is a deficient number, since it is larger than the sum of its proper divisors (46845781).

221230312211 is an equidigital number, since it uses as much as digits as its factorization.

221230312211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46845780.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221230312211 its reverse (112213032122), we get a palindrome (333443344333).

The spelling of 221230312211 in words is "two hundred twenty-one billion, two hundred thirty million, three hundred twelve thousand, two hundred eleven".