221223310331 has 4 divisors (see below), whose sum is σ = 230841715152. Its totient is φ = 211604905512.

The previous prime is 221223310309. The next prime is 221223310339. The reversal of 221223310331 is 133013322122.

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 221223310331 - 2¹⁸ = 221223048187 is a prime.

It is a super-2 number, since 2×221223310331² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 9618404797 = 221223310331 / (2 + 2 + 1 + 2 + 2 + 3 + 3 + 1 + 0 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221223310297 and 221223310306.

It is not an unprimeable number, because it can be changed into a prime (221223310339) 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, 4809202376 + ... + 4809202421.

It is an arithmetic number, because the mean of its divisors is an integer number (57710428788).

Almost surely, 2^221223310331 is an apocalyptic number.

221223310331 is a deficient number, since it is larger than the sum of its proper divisors (9618404821).

221223310331 is an equidigital number, since it uses as much as digits as its factorization.

221223310331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9618404820.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 221223310331 its reverse (133013322122), we get a palindrome (354236632453).

The spelling of 221223310331 in words is "two hundred twenty-one billion, two hundred twenty-three million, three hundred ten thousand, three hundred thirty-one".