21383804250 has 128 divisors (see below), whose sum is σ = 59882135040. Its totient is φ = 5646801600.

The previous prime is 21383804203. The next prime is 21383804261. The reversal of 21383804250 is 5240838312.

21383804250 is a `hidden beast` number, since 21 + 3 + 8 + 380 + 4 + 250 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 679872 + ... + 710628.

It is an arithmetic number, because the mean of its divisors is an integer number (467829180).

Almost surely, 2^21383804250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21383804250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29941067520).

21383804250 is an abundant number, since it is smaller than the sum of its proper divisors (38498330790).

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

21383804250 is a wasteful number, since it uses less digits than its factorization.

21383804250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30886 (or 30870 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 21383804250 in words is "twenty-one billion, three hundred eighty-three million, eight hundred four thousand, two hundred fifty".