221030212231 has 4 divisors (see below), whose sum is σ = 225732982752. Its totient is φ = 216327441712.

The previous prime is 221030212223. The next prime is 221030212237. The reversal of 221030212231 is 132212030122.

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 221030212231 - 2³ = 221030212223 is a prime.

It is a super-3 number, since 3×221030212231³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221030212199 and 221030212208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221030212237) 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, 2351385190 + ... + 2351385283.

It is an arithmetic number, because the mean of its divisors is an integer number (56433245688).

Almost surely, 2^221030212231 is an apocalyptic number.

221030212231 is a deficient number, since it is larger than the sum of its proper divisors (4702770521).

221030212231 is an equidigital number, since it uses as much as digits as its factorization.

221030212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702770520.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221030212231 its reverse (132212030122), we get a palindrome (353242242353).

The spelling of 221030212231 in words is "two hundred twenty-one billion, thirty million, two hundred twelve thousand, two hundred thirty-one".