21868703666720 has 24 divisors (see below), whose sum is σ = 51664812413004. Its totient is φ = 8747481466624.

The previous prime is 21868703666669. The next prime is 21868703666731. The reversal of 21868703666720 is 2766630786812.

It can be written as a sum of positive squares in 2 ways, for example, as 19708520967184 + 2160182699536 = 4439428^2 + 1469756^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68339698799 + ... + 68339699118.

Almost surely, 2^{21868703666720} is an apocalyptic number.

21868703666720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21868703666720 is an abundant number, since it is smaller than the sum of its proper divisors (29796108746284).

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

21868703666720 is a wasteful number, since it uses less digits than its factorization.

21868703666720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136679397932 (or 136679397924 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 62.

The spelling of 21868703666720 in words is "twenty-one trillion, eight hundred sixty-eight billion, seven hundred three million, six hundred sixty-six thousand, seven hundred twenty".