21334312361 has 2 divisors, whose sum is σ = 21334312362. Its totient is φ = 21334312360.

The previous prime is 21334312343. The next prime is 21334312381. The reversal of 21334312361 is 16321343312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11897355625 + 9436956736 = 109075^2 + 97144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21334312361 is a prime.

It is not a weakly prime, because it can be changed into another prime (21334312381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667156180 + 10667156181.

It is an arithmetic number, because the mean of its divisors is an integer number (10667156181).

Almost surely, 2^21334312361 is an apocalyptic number.

It is an amenable number.

21334312361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334312361 is an equidigital number, since it uses as much as digits as its factorization.

21334312361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 29.

Adding to 21334312361 its reverse (16321343312), we get a palindrome (37655655673).

The spelling of 21334312361 in words is "twenty-one billion, three hundred thirty-four million, three hundred twelve thousand, three hundred sixty-one".