9645130246921 has 9 divisors (see below), whose sum is σ = 10444178837781. Its totient is φ = 8903159883072.

The previous prime is 9645130246877. The next prime is 9645130246933. The reversal of 9645130246921 is 1296420315469.

It is a happy number.

The square root of 9645130246921 is 3105661.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 38725910521 + 9606404336400 = 196789^2 + 3099420^2 .

It is not a de Polignac number, because 9645130246921 - 2¹¹ = 9645130244873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9645130246951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 40254145 + ... + 40493041.

It is an arithmetic number, because the mean of its divisors is an integer number (1160464315309).

Almost surely, 2^{9645130246921} is an apocalyptic number.

9645130246921 is the 3105661-st square number.

9645130246921 is the 1552831-st centered octagonal number.

It is an amenable number.

9645130246921 is a deficient number, since it is larger than the sum of its proper divisors (799048590860).

9645130246921 is an frugal number, since it uses more digits than its factorization.

9645130246921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477820 (or 238910 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 9645130246921 in words is "nine trillion, six hundred forty-five billion, one hundred thirty million, two hundred forty-six thousand, nine hundred twenty-one".