21670338371659 has 2 divisors, whose sum is σ = 21670338371660. Its totient is φ = 21670338371658.

The previous prime is 21670338371611. The next prime is 21670338371743. The reversal of 21670338371659 is 95617383307612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21670338371659 - 2⁹ = 21670338371147 is a prime.

It is a super-2 number, since 2×21670338371659² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21670338371597 and 21670338371606.

It is not a weakly prime, because it can be changed into another prime (21670338371459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10835169185829 + 10835169185830.

It is an arithmetic number, because the mean of its divisors is an integer number (10835169185830).

Almost surely, 2^{21670338371659} is an apocalyptic number.

21670338371659 is a deficient number, since it is larger than the sum of its proper divisors (1).

21670338371659 is an equidigital number, since it uses as much as digits as its factorization.

21670338371659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34292160, while the sum is 61.

The spelling of 21670338371659 in words is "twenty-one trillion, six hundred seventy billion, three hundred thirty-eight million, three hundred seventy-one thousand, six hundred fifty-nine".