9675872021 has 4 divisors (see below), whose sum is σ = 9679516332. Its totient is φ = 9672227712.

The previous prime is 9675871981. The next prime is 9675872027. The reversal of 9675872021 is 1202785769.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1202785769 = 4241 ⋅283609.

It can be written as a sum of positive squares in 2 ways, for example, as 4527809521 + 5148062500 = 67289^2 + 71750^2 .

It is a cyclic number.

It is not a de Polignac number, because 9675872021 - 2¹⁸ = 9675609877 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 (9675872027) 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, 1818170 + ... + 1823483.

It is an arithmetic number, because the mean of its divisors is an integer number (2419879083).

Almost surely, 2^9675872021 is an apocalyptic number.

It is an amenable number.

9675872021 is a deficient number, since it is larger than the sum of its proper divisors (3644311).

9675872021 is a wasteful number, since it uses less digits than its factorization.

9675872021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644310.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 9675872021 is about 98366.0104965125. The cubic root of 9675872021 is about 2130.9014839270.

The spelling of 9675872021 in words is "nine billion, six hundred seventy-five million, eight hundred seventy-two thousand, twenty-one".