9721206789 has 16 divisors (see below), whose sum is σ = 15128444928. Its totient is φ = 5436783792.

The previous prime is 9721206787. The next prime is 9721206791. The reversal of 9721206789 is 9876021279.

It is an interprime number because it is at equal distance from previous prime (9721206787) and next prime (9721206791).

It is not a de Polignac number, because 9721206789 - 2¹ = 9721206787 is a prime.

It is a super-2 number, since 2×9721206789² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721206787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4923637 + ... + 4925610.

It is an arithmetic number, because the mean of its divisors is an integer number (945527808).

Almost surely, 2^9721206789 is an apocalyptic number.

It is an amenable number.

9721206789 is a deficient number, since it is larger than the sum of its proper divisors (5407238139).

9721206789 is a wasteful number, since it uses less digits than its factorization.

9721206789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9849304.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 9721206789 is about 98596.1803976199. The cubic root of 9721206789 is about 2134.2243004324.

The spelling of 9721206789 in words is "nine billion, seven hundred twenty-one million, two hundred six thousand, seven hundred eighty-nine".