21904223782 has 8 divisors (see below), whose sum is σ = 37550097936. Its totient is φ = 9387524472.

The previous prime is 21904223743. The next prime is 21904223807. The reversal of 21904223782 is 28732240912.

It is a happy number.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 782293693 + ... + 782293720.

It is an arithmetic number, because the mean of its divisors is an integer number (4693762242).

Almost surely, 2^21904223782 is an apocalyptic number.

21904223782 is a deficient number, since it is larger than the sum of its proper divisors (15645874154).

21904223782 is a wasteful number, since it uses less digits than its factorization.

21904223782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564587422.

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 21904223782 in words is "twenty-one billion, nine hundred four million, two hundred twenty-three thousand, seven hundred eighty-two".