9799999021 has 8 divisors (see below), whose sum is σ = 9905235704. Its totient is φ = 9695324160.

The previous prime is 9799999019. The next prime is 9799999039. The reversal of 9799999021 is 1209999979.

It can be written as a sum of positive squares in 4 ways, for example, as 1141696521 + 8658302500 = 33789^2 + 93050^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9799999021 - 2¹ = 9799999019 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 (9799990021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105336 + ... + 175201.

It is an arithmetic number, because the mean of its divisors is an integer number (1238154463).

Almost surely, 2^9799999021 is an apocalyptic number.

It is an amenable number.

9799999021 is a deficient number, since it is larger than the sum of its proper divisors (105236683).

9799999021 is a wasteful number, since it uses less digits than its factorization.

9799999021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280911.

The product of its (nonzero) digits is 7440174, while the sum is 64.

The square root of 9799999021 is about 98994.9444214198. The cubic root of 9799999021 is about 2139.9748898704.

It can be divided in two parts, 979 and 9999021, that added together give a 7-th power (10000000 = 10⁷).

The spelling of 9799999021 in words is "nine billion, seven hundred ninety-nine million, nine hundred ninety-nine thousand, twenty-one".