9921688058 has 4 divisors (see below), whose sum is σ = 14882532090. Its totient is φ = 4960844028.

The previous prime is 9921688057. The next prime is 9921688061. The reversal of 9921688058 is 8508861299.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 9231942889 + 689745169 = 96083^2 + 26263^2 .

It is a super-3 number, since 3×9921688058³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 9921687994 and 9921688012.

It is not an unprimeable number, because it can be changed into a prime (9921688057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2480422013 + ... + 2480422016.

Almost surely, 2^9921688058 is an apocalyptic number.

9921688058 is a deficient number, since it is larger than the sum of its proper divisors (4960844032).

9921688058 is a wasteful number, since it uses less digits than its factorization.

9921688058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960844031.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The square root of 9921688058 is about 99607.6706785175. The cubic root of 9921688058 is about 2148.7960129745.

The spelling of 9921688058 in words is "nine billion, nine hundred twenty-one million, six hundred eighty-eight thousand, fifty-eight".