21839919009 has 16 divisors (see below), whose sum is σ = 29713643520. Its totient is φ = 14265884880.

The previous prime is 21839918981. The next prime is 21839919041. The reversal of 21839919009 is 90091993812.

It is not a de Polignac number, because 21839919009 - 2²⁰ = 21838870433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21839919209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320677 + ... + 382770.

It is an arithmetic number, because the mean of its divisors is an integer number (1857102720).

Almost surely, 2^21839919009 is an apocalyptic number.

It is an amenable number.

21839919009 is a deficient number, since it is larger than the sum of its proper divisors (7873724511).

21839919009 is a wasteful number, since it uses less digits than its factorization.

21839919009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703660.

The product of its (nonzero) digits is 314928, while the sum is 51.

The spelling of 21839919009 in words is "twenty-one billion, eight hundred thirty-nine million, nine hundred nineteen thousand, nine".