21788918854 has 8 divisors (see below), whose sum is σ = 34104394800. Its totient is φ = 10420787256.

The previous prime is 21788918843. The next prime is 21788918897. The reversal of 21788918854 is 45881988712.

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

It is a super-3 number, since 3×21788918854³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21788918792 and 21788918801.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 236836029 + ... + 236836120.

It is an arithmetic number, because the mean of its divisors is an integer number (4263049350).

Almost surely, 2^21788918854 is an apocalyptic number.

21788918854 is a deficient number, since it is larger than the sum of its proper divisors (12315475946).

21788918854 is a wasteful number, since it uses less digits than its factorization.

21788918854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473672174.

The product of its digits is 10321920, while the sum is 61.

The spelling of 21788918854 in words is "twenty-one billion, seven hundred eighty-eight million, nine hundred eighteen thousand, eight hundred fifty-four".