21304314839 has 2 divisors, whose sum is σ = 21304314840. Its totient is φ = 21304314838.

The previous prime is 21304314803. The next prime is 21304314877. The reversal of 21304314839 is 93841340312.

It is an a-pointer prime, because the next prime (21304314877) can be obtained adding 21304314839 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21304314839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21304314539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652157419 + 10652157420.

It is an arithmetic number, because the mean of its divisors is an integer number (10652157420).

Almost surely, 2^21304314839 is an apocalyptic number.

21304314839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304314839 is an equidigital number, since it uses as much as digits as its factorization.

21304314839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 21304314839 in words is "twenty-one billion, three hundred four million, three hundred fourteen thousand, eight hundred thirty-nine".