21200640192 has 224 divisors, whose sum is σ = 67136467200. Its totient is φ = 6538807296.

The previous prime is 21200640163. The next prime is 21200640203. The reversal of 21200640192 is 29104600212.

21200640192 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 0 + 640 + 19 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1404268 + ... + 1419284.

Almost surely, 2^21200640192 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 21200640192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33568233600).

21200640192 is an abundant number, since it is smaller than the sum of its proper divisors (45935827008).

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

21200640192 is a wasteful number, since it uses less digits than its factorization.

21200640192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15100 (or 15084 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21200640192 in words is "twenty-one billion, two hundred million, six hundred forty thousand, one hundred ninety-two".