21992000208 has 80 divisors (see below), whose sum is σ = 58698326400. Its totient is φ = 7089735168.

The previous prime is 21992000201. The next prime is 21992000263. The reversal of 21992000208 is 80200029912.

It is a happy number.

It is a Cunningham number, because it is equal to 148297²-1.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21992000201) 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 15 ways as a sum of consecutive naturals, for example, 259518 + ... + 333666.

It is an arithmetic number, because the mean of its divisors is an integer number (733729080).

Almost surely, 2^21992000208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21992000208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29349163200).

21992000208 is an abundant number, since it is smaller than the sum of its proper divisors (36706326192).

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

21992000208 is a wasteful number, since it uses less digits than its factorization.

21992000208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74364 (or 74358 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The spelling of 21992000208 in words is "twenty-one billion, nine hundred ninety-two million, two hundred eight", and thus it is an aban number.