21867800688 has 50 divisors (see below), whose sum is σ = 63291763304. Its totient is φ = 7289266464.

The previous prime is 21867800681. The next prime is 21867800719. The reversal of 21867800688 is 88600876812.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21867800681) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8435356 + ... + 8437947.

Almost surely, 2^21867800688 is an apocalyptic number.

It is an amenable number.

21867800688 is an abundant number, since it is smaller than the sum of its proper divisors (41423962616).

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

21867800688 is a wasteful number, since it uses less digits than its factorization.

21867800688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16873323 (or 16873308 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 54.

The spelling of 21867800688 in words is "twenty-one billion, eight hundred sixty-seven million, eight hundred thousand, six hundred eighty-eight".