21340360267 has 2 divisors, whose sum is σ = 21340360268. Its totient is φ = 21340360266.

The previous prime is 21340360243. The next prime is 21340360277. The reversal of 21340360267 is 76206304312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21340360267 - 2¹⁵ = 21340327499 is a prime.

It is a super-2 number, since 2×21340360267² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21340360277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670180133 + 10670180134.

It is an arithmetic number, because the mean of its divisors is an integer number (10670180134).

Almost surely, 2^21340360267 is an apocalyptic number.

21340360267 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340360267 is an equidigital number, since it uses as much as digits as its factorization.

21340360267 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 34.

Adding to 21340360267 its reverse (76206304312), we get a palindrome (97546664579).

The spelling of 21340360267 in words is "twenty-one billion, three hundred forty million, three hundred sixty thousand, two hundred sixty-seven".