21468889409 has 8 divisors (see below), whose sum is σ = 23991841440. Its totient is φ = 19041143200.

The previous prime is 21468889397. The next prime is 21468889411. The reversal of 21468889409 is 90498886412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21468889409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21468889459) 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 7 ways as a sum of consecutive naturals, for example, 23800979 + ... + 23801880.

It is an arithmetic number, because the mean of its divisors is an integer number (2998980180).

Almost surely, 2^21468889409 is an apocalyptic number.

It is an amenable number.

21468889409 is a deficient number, since it is larger than the sum of its proper divisors (2522952031).

21468889409 is a wasteful number, since it uses less digits than its factorization.

21468889409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47602911.

The product of its (nonzero) digits is 7962624, while the sum is 59.

The spelling of 21468889409 in words is "twenty-one billion, four hundred sixty-eight million, eight hundred eighty-nine thousand, four hundred nine".