21786422866 has 16 divisors (see below), whose sum is σ = 35203281624. Its totient is φ = 10052463744.

The previous prime is 21786422839. The next prime is 21786422873. The reversal of 21786422866 is 66822468712.

It can be written as a sum of positive squares in 4 ways, for example, as 4118430625 + 17667992241 = 64175^2 + 132921^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20635 + ... + 209758.

Almost surely, 2^21786422866 is an apocalyptic number.

21786422866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21786422866 is a deficient number, since it is larger than the sum of its proper divisors (13416858758).

21786422866 is a wasteful number, since it uses less digits than its factorization.

21786422866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234045.

The product of its digits is 3096576, while the sum is 52.

The spelling of 21786422866 in words is "twenty-one billion, seven hundred eighty-six million, four hundred twenty-two thousand, eight hundred sixty-six".