9435016821 has 4 divisors (see below), whose sum is σ = 12580022432. Its totient is φ = 6290011212.

The previous prime is 9435016781. The next prime is 9435016853. The reversal of 9435016821 is 1286105349.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1286105349 = 3 ⋅428701783.

It is not a de Polignac number, because 9435016821 - 2⁶ = 9435016757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9435016821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9435016891) 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, 1572502801 + ... + 1572502806.

It is an arithmetic number, because the mean of its divisors is an integer number (3145005608).

Almost surely, 2^9435016821 is an apocalyptic number.

It is an amenable number.

9435016821 is a deficient number, since it is larger than the sum of its proper divisors (3145005611).

9435016821 is a wasteful number, since it uses less digits than its factorization.

9435016821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145005610.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 9435016821 is about 97134.0147476671. The cubic root of 9435016821 is about 2113.0716641364.

The spelling of 9435016821 in words is "nine billion, four hundred thirty-five million, sixteen thousand, eight hundred twenty-one".