21698959682 has 8 divisors (see below), whose sum is σ = 32549403852. Its totient is φ = 10849158400.

The previous prime is 21698959669. The next prime is 21698959687. The reversal of 21698959682 is 28695989612.

It can be written as a sum of positive squares in 2 ways, for example, as 21161229961 + 537729721 = 145469^2 + 23189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21698959682³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21698959687) 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 3 ways as a sum of consecutive naturals, for example, 64919 + ... + 218202.

Almost surely, 2^21698959682 is an apocalyptic number.

21698959682 is a deficient number, since it is larger than the sum of its proper divisors (10850444170).

21698959682 is a wasteful number, since it uses less digits than its factorization.

21698959682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321444.

The product of its digits is 33592320, while the sum is 65.

The spelling of 21698959682 in words is "twenty-one billion, six hundred ninety-eight million, nine hundred fifty-nine thousand, six hundred eighty-two".