9821430065 has 16 divisors (see below), whose sum is σ = 11893616640. Its totient is φ = 7785368640.

The previous prime is 9821430061. The next prime is 9821430079. The reversal of 9821430065 is 5600341289.

It is a happy number.

It is not a de Polignac number, because 9821430065 - 2² = 9821430061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9821430061) 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, 511916 + ... + 530754.

It is an arithmetic number, because the mean of its divisors is an integer number (743351040).

Almost surely, 2^9821430065 is an apocalyptic number.

It is an amenable number.

9821430065 is a deficient number, since it is larger than the sum of its proper divisors (2072186575).

9821430065 is a wasteful number, since it uses less digits than its factorization.

9821430065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19792.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 9821430065 is about 99103.1284319521. The cubic root of 9821430065 is about 2141.5336827364.

The spelling of 9821430065 in words is "nine billion, eight hundred twenty-one million, four hundred thirty thousand, sixty-five".