21898679809 has 8 divisors (see below), whose sum is σ = 22043047680. Its totient is φ = 21754374096.

The previous prime is 21898679791. The next prime is 21898679821. The reversal of 21898679809 is 90897689812.

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

It is a cyclic number.

It is not a de Polignac number, because 21898679809 - 2¹¹ = 21898677761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21898679879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848112 + ... + 873550.

It is an arithmetic number, because the mean of its divisors is an integer number (2755380960).

Almost surely, 2^21898679809 is an apocalyptic number.

It is an amenable number.

21898679809 is a deficient number, since it is larger than the sum of its proper divisors (144367871).

21898679809 is a wasteful number, since it uses less digits than its factorization.

21898679809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31079.

The product of its (nonzero) digits is 31352832, while the sum is 67.

The spelling of 21898679809 in words is "twenty-one billion, eight hundred ninety-eight million, six hundred seventy-nine thousand, eight hundred nine".