21907709200 has 120 divisors (see below), whose sum is σ = 56886095168. Its totient is φ = 8059875840.

The previous prime is 21907709191. The next prime is 21907709203. The reversal of 21907709200 is 290770912.

It is a self number, because there is not a number n which added to its sum of digits gives 21907709200.

It is not an unprimeable number, because it can be changed into a prime (21907709203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1464157 + ... + 1479043.

Almost surely, 2^21907709200 is an apocalyptic number.

21907709200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21907709200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28443047584).

21907709200 is an abundant number, since it is smaller than the sum of its proper divisors (34978385968).

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

21907709200 is a wasteful number, since it uses less digits than its factorization.

21907709200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15201 (or 15190 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 37.

The spelling of 21907709200 in words is "twenty-one billion, nine hundred seven million, seven hundred nine thousand, two hundred".