21223356347 has 2 divisors, whose sum is σ = 21223356348. Its totient is φ = 21223356346.

The previous prime is 21223356337. The next prime is 21223356373. The reversal of 21223356347 is 74365332212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223356347 - 2¹⁸ = 21223094203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21223356347.

It is not a weakly prime, because it can be changed into another prime (21223356337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611678173 + 10611678174.

It is an arithmetic number, because the mean of its divisors is an integer number (10611678174).

Almost surely, 2^21223356347 is an apocalyptic number.

21223356347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223356347 is an equidigital number, since it uses as much as digits as its factorization.

21223356347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 38.

Adding to 21223356347 its reverse (74365332212), we get a palindrome (95588688559).

The spelling of 21223356347 in words is "twenty-one billion, two hundred twenty-three million, three hundred fifty-six thousand, three hundred forty-seven".