21304240367 has 2 divisors, whose sum is σ = 21304240368. Its totient is φ = 21304240366.

The previous prime is 21304240361. The next prime is 21304240427. The reversal of 21304240367 is 76304240312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21304240367 - 2⁶ = 21304240303 is a prime.

It is a super-2 number, since 2×21304240367² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21304240361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652120183 + 10652120184.

It is an arithmetic number, because the mean of its divisors is an integer number (10652120184).

Almost surely, 2^21304240367 is an apocalyptic number.

21304240367 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304240367 is an equidigital number, since it uses as much as digits as its factorization.

21304240367 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 32.

Adding to 21304240367 its reverse (76304240312), we get a palindrome (97608480679).

Subtracting 21304240367 from its reverse (76304240312), we obtain a palindrome (54999999945).

The spelling of 21304240367 in words is "twenty-one billion, three hundred four million, two hundred forty thousand, three hundred sixty-seven".