21108306419 has 4 divisors (see below), whose sum is σ = 22026058896. Its totient is φ = 20190553944.

The previous prime is 21108306391. The next prime is 21108306467. The reversal of 21108306419 is 91460380112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21108306419 - 2²⁴ = 21091529203 is a prime.

It is a super-2 number, since 2×21108306419² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21108306119) 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 in 3 ways as a sum of consecutive naturals, for example, 458876204 + ... + 458876249.

It is an arithmetic number, because the mean of its divisors is an integer number (5506514724).

Almost surely, 2^21108306419 is an apocalyptic number.

21108306419 is a deficient number, since it is larger than the sum of its proper divisors (917752477).

21108306419 is an equidigital number, since it uses as much as digits as its factorization.

21108306419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917752476.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 21108306419 in words is "twenty-one billion, one hundred eight million, three hundred six thousand, four hundred nineteen".