21304134569 has 2 divisors, whose sum is σ = 21304134570. Its totient is φ = 21304134568.

The previous prime is 21304134539. The next prime is 21304134671. The reversal of 21304134569 is 96543140312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19268771344 + 2035363225 = 138812^2 + 45115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21304134569 is a prime.

It is a super-2 number, since 2×21304134569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21304134539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652067284 + 10652067285.

It is an arithmetic number, because the mean of its divisors is an integer number (10652067285).

Almost surely, 2^21304134569 is an apocalyptic number.

It is an amenable number.

21304134569 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304134569 is an equidigital number, since it uses as much as digits as its factorization.

21304134569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 21304134569 in words is "twenty-one billion, three hundred four million, one hundred thirty-four thousand, five hundred sixty-nine".