21701885050 has 12 divisors (see below), whose sum is σ = 40365506286. Its totient is φ = 8680754000.

The previous prime is 21701885047. The next prime is 21701885059. The reversal of 21701885050 is 5058810712.

It can be written as a sum of positive squares in 3 ways, for example, as 10438095889 + 11263789161 = 102167^2 + 106131^2 .

It is not an unprimeable number, because it can be changed into a prime (21701885059) 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 5 ways as a sum of consecutive naturals, for example, 217018801 + ... + 217018900.

Almost surely, 2^21701885050 is an apocalyptic number.

21701885050 is a deficient number, since it is larger than the sum of its proper divisors (18663621236).

21701885050 is a wasteful number, since it uses less digits than its factorization.

21701885050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434037713 (or 434037708 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 37.

The spelling of 21701885050 in words is "twenty-one billion, seven hundred one million, eight hundred eighty-five thousand, fifty".