21354544607659 has 2 divisors, whose sum is σ = 21354544607660. Its totient is φ = 21354544607658.

The previous prime is 21354544607633. The next prime is 21354544607707. The reversal of 21354544607659 is 95670644545312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21354544607659 - 2²¹ = 21354542510507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21354544607597 and 21354544607606.

It is not a weakly prime, because it can be changed into another prime (21354544607609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10677272303829 + 10677272303830.

It is an arithmetic number, because the mean of its divisors is an integer number (10677272303830).

Almost surely, 2^{21354544607659} is an apocalyptic number.

21354544607659 is a deficient number, since it is larger than the sum of its proper divisors (1).

21354544607659 is an equidigital number, since it uses as much as digits as its factorization.

21354544607659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864000, while the sum is 61.

The spelling of 21354544607659 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred forty-four million, six hundred seven thousand, six hundred fifty-nine".