21909319219 has 2 divisors, whose sum is σ = 21909319220. Its totient is φ = 21909319218.

The previous prime is 21909319217. The next prime is 21909319249. The reversal of 21909319219 is 91291390912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21909319219 - 2¹ = 21909319217 is a prime.

It is a super-2 number, since 2×21909319219² (a number of 21 digits) contains 22 as substring.

Together with 21909319217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21909319213) 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, 10954659609 + 10954659610.

It is an arithmetic number, because the mean of its divisors is an integer number (10954659610).

Almost surely, 2^21909319219 is an apocalyptic number.

21909319219 is a deficient number, since it is larger than the sum of its proper divisors (1).

21909319219 is an equidigital number, since it uses as much as digits as its factorization.

21909319219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 46.

The spelling of 21909319219 in words is "twenty-one billion, nine hundred nine million, three hundred nineteen thousand, two hundred nineteen".