21738970159 has 2 divisors, whose sum is σ = 21738970160. Its totient is φ = 21738970158.

The previous prime is 21738970153. The next prime is 21738970199. The reversal of 21738970159 is 95107983712.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21738970159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21738970153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10869485079 + 10869485080.

It is an arithmetic number, because the mean of its divisors is an integer number (10869485080).

Almost surely, 2^21738970159 is an apocalyptic number.

21738970159 is a deficient number, since it is larger than the sum of its proper divisors (1).

21738970159 is an equidigital number, since it uses as much as digits as its factorization.

21738970159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 21738970159 in words is "twenty-one billion, seven hundred thirty-eight million, nine hundred seventy thousand, one hundred fifty-nine".