21304434113 has 2 divisors, whose sum is σ = 21304434114. Its totient is φ = 21304434112.

The previous prime is 21304434097. The next prime is 21304434161. The reversal of 21304434113 is 31143440312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20651989264 + 652444849 = 143708^2 + 25543^2 .

It is a cyclic number.

It is not a de Polignac number, because 21304434113 - 2⁴ = 21304434097 is a prime.

It is not a weakly prime, because it can be changed into another prime (21304434013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652217056 + 10652217057.

It is an arithmetic number, because the mean of its divisors is an integer number (10652217057).

Almost surely, 2^21304434113 is an apocalyptic number.

It is an amenable number.

21304434113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304434113 is an equidigital number, since it uses as much as digits as its factorization.

21304434113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 21304434113 its reverse (31143440312), we get a palindrome (52447874425).

The spelling of 21304434113 in words is "twenty-one billion, three hundred four million, four hundred thirty-four thousand, one hundred thirteen".