21847839250 has 16 divisors (see below), whose sum is σ = 40899155544. Its totient is φ = 8739135600.

The previous prime is 21847839229. The next prime is 21847839259. The reversal of 21847839250 is 5293874812.

It can be written as a sum of positive squares in 4 ways, for example, as 5969571169 + 15878268081 = 77263^2 + 126009^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21847839194 and 21847839203.

It is not an unprimeable number, because it can be changed into a prime (21847839259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43695429 + ... + 43695928.

Almost surely, 2^21847839250 is an apocalyptic number.

21847839250 is a deficient number, since it is larger than the sum of its proper divisors (19051316294).

21847839250 is an equidigital number, since it uses as much as digits as its factorization.

21847839250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87391374 (or 87391364 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 21847839250 in words is "twenty-one billion, eight hundred forty-seven million, eight hundred thirty-nine thousand, two hundred fifty".