21304078759 has 2 divisors, whose sum is σ = 21304078760. Its totient is φ = 21304078758.

The previous prime is 21304078729. The next prime is 21304078793. The reversal of 21304078759 is 95787040312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21304078759 - 2⁹ = 21304078247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21304078729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652039379 + 10652039380.

It is an arithmetic number, because the mean of its divisors is an integer number (10652039380).

Almost surely, 2^21304078759 is an apocalyptic number.

21304078759 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304078759 is an equidigital number, since it uses as much as digits as its factorization.

21304078759 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 21304078759 in words is "twenty-one billion, three hundred four million, seventy-eight thousand, seven hundred fifty-nine".