21635702848 has 14 divisors (see below), whose sum is σ = 42933347966. Its totient is φ = 10817851392.

The previous prime is 21635702827. The next prime is 21635702849. The reversal of 21635702848 is 84820753612.

It can be written as a sum of positive squares in only one way, i.e., 18602777664 + 3032925184 = 136392^2 + 55072^2 .

It is a super-2 number, since 2×21635702848² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21635702798 and 21635702807.

It is not an unprimeable number, because it can be changed into a prime (21635702849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169028865 + ... + 169028992.

Almost surely, 2^21635702848 is an apocalyptic number.

It is an amenable number.

21635702848 is a deficient number, since it is larger than the sum of its proper divisors (21297645118).

21635702848 is an equidigital number, since it uses as much as digits as its factorization.

21635702848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338057869 (or 338057859 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 21635702848 in words is "twenty-one billion, six hundred thirty-five million, seven hundred two thousand, eight hundred forty-eight".