21786843824 has 40 divisors (see below), whose sum is σ = 42598783920. Its totient is φ = 10794067200.

The previous prime is 21786843823. The next prime is 21786843839. The reversal of 21786843824 is 42834868712.

It is a super-2 number, since 2×21786843824² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21786843821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 759014 + ... + 787194.

It is an arithmetic number, because the mean of its divisors is an integer number (1064969598).

Almost surely, 2^21786843824 is an apocalyptic number.

It is an amenable number.

21786843824 is a deficient number, since it is larger than the sum of its proper divisors (20811940096).

21786843824 is a wasteful number, since it uses less digits than its factorization.

21786843824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28629 (or 28623 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 53.

The spelling of 21786843824 in words is "twenty-one billion, seven hundred eighty-six million, eight hundred forty-three thousand, eight hundred twenty-four".