9688550021 has 4 divisors (see below), whose sum is σ = 9825008544. Its totient is φ = 9552091500.

The previous prime is 9688550009. The next prime is 9688550101. The reversal of 9688550021 is 1200558869.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1200558869 = 37 ⋅32447537.

It is not a de Polignac number, because 9688550021 - 2¹⁸ = 9688287877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9688550321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68229155 + ... + 68229296.

It is an arithmetic number, because the mean of its divisors is an integer number (2456252136).

Almost surely, 2^9688550021 is an apocalyptic number.

It is an amenable number.

9688550021 is a deficient number, since it is larger than the sum of its proper divisors (136458523).

9688550021 is a wasteful number, since it uses less digits than its factorization.

9688550021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136458522.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 9688550021 is about 98430.4323926295. The cubic root of 9688550021 is about 2131.8317628142.

The spelling of 9688550021 in words is "nine billion, six hundred eighty-eight million, five hundred fifty thousand, twenty-one".