21935393896 has 32 divisors (see below), whose sum is σ = 46898074440. Its totient is φ = 9528496128.

The previous prime is 21935393891. The next prime is 21935393911. The reversal of 21935393896 is 69839353912.

It can be written as a sum of positive squares in 4 ways, for example, as 21447602500 + 487791396 = 146450^2 + 22086^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21935393896.

It is not an unprimeable number, because it can be changed into a prime (21935393891) 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 7 ways as a sum of consecutive naturals, for example, 6201681 + ... + 6205216.

Almost surely, 2^21935393896 is an apocalyptic number.

21935393896 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21935393896 is an abundant number, since it is smaller than the sum of its proper divisors (24962680544).

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

21935393896 is a wasteful number, since it uses less digits than its factorization.

21935393896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12406933 (or 12406929 counting only the distinct ones).

The product of its digits is 9447840, while the sum is 58.

The spelling of 21935393896 in words is "twenty-one billion, nine hundred thirty-five million, three hundred ninety-three thousand, eight hundred ninety-six".