21424308866 has 8 divisors (see below), whose sum is σ = 32137746300. Its totient is φ = 10711726768.

The previous prime is 21424308833. The next prime is 21424308869. The reversal of 21424308866 is 66880342412.

It can be written as a sum of positive squares in 2 ways, for example, as 17921444641 + 3502864225 = 133871^2 + 59185^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21424308869) 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 3 ways as a sum of consecutive naturals, for example, 147041 + ... + 253908.

Almost surely, 2^21424308866 is an apocalyptic number.

21424308866 is a deficient number, since it is larger than the sum of its proper divisors (10713437434).

21424308866 is a wasteful number, since it uses less digits than its factorization.

21424308866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427668.

The product of its (nonzero) digits is 442368, while the sum is 44.

The spelling of 21424308866 in words is "twenty-one billion, four hundred twenty-four million, three hundred eight thousand, eight hundred sixty-six".