21719244786 has 16 divisors (see below), whose sum is σ = 43698602304. Its totient is φ = 7196396144.

The previous prime is 21719244709. The next prime is 21719244791. The reversal of 21719244786 is 68744291712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10836945 + ... + 10838948.

It is an arithmetic number, because the mean of its divisors is an integer number (2731162644).

Almost surely, 2^21719244786 is an apocalyptic number.

21719244786 is an abundant number, since it is smaller than the sum of its proper divisors (21979357518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21719244786 is a wasteful number, since it uses less digits than its factorization.

21719244786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21676065.

The product of its digits is 1354752, while the sum is 51.

The spelling of 21719244786 in words is "twenty-one billion, seven hundred nineteen million, two hundred forty-four thousand, seven hundred eighty-six".