21343572659 has 2 divisors, whose sum is σ = 21343572660. Its totient is φ = 21343572658.

The previous prime is 21343572617. The next prime is 21343572713. The reversal of 21343572659 is 95627534312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21343572659 - 2²⁸ = 21075137203 is a prime.

It is not a weakly prime, because it can be changed into another prime (21343572559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671786329 + 10671786330.

It is an arithmetic number, because the mean of its divisors is an integer number (10671786330).

Almost surely, 2^21343572659 is an apocalyptic number.

21343572659 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343572659 is an equidigital number, since it uses as much as digits as its factorization.

21343572659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 47.

The spelling of 21343572659 in words is "twenty-one billion, three hundred forty-three million, five hundred seventy-two thousand, six hundred fifty-nine".