21608200919 has 2 divisors, whose sum is σ = 21608200920. Its totient is φ = 21608200918.

The previous prime is 21608200907. The next prime is 21608200963. The reversal of 21608200919 is 91900280612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21608200919 is a prime.

It is a super-2 number, since 2×21608200919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21608202919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10804100459 + 10804100460.

It is an arithmetic number, because the mean of its divisors is an integer number (10804100460).

Almost surely, 2^21608200919 is an apocalyptic number.

21608200919 is a deficient number, since it is larger than the sum of its proper divisors (1).

21608200919 is an equidigital number, since it uses as much as digits as its factorization.

21608200919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 21608200919 in words is "twenty-one billion, six hundred eight million, two hundred thousand, nine hundred nineteen".