21608200907 has 2 divisors, whose sum is σ = 21608200908. Its totient is φ = 21608200906.

The previous prime is 21608200871. The next prime is 21608200919. The reversal of 21608200907 is 70900280612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21608200907 - 2⁶ = 21608200843 is a prime.

It is not a weakly prime, because it can be changed into another prime (21608200987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10804100453 + 10804100454.

It is an arithmetic number, because the mean of its divisors is an integer number (10804100454).

Almost surely, 2^21608200907 is an apocalyptic number.

21608200907 is a deficient number, since it is larger than the sum of its proper divisors (1).

21608200907 is an equidigital number, since it uses as much as digits as its factorization.

21608200907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 21608200907 in words is "twenty-one billion, six hundred eight million, two hundred thousand, nine hundred seven".