9960885821 has 4 divisors (see below), whose sum is σ = 9975599772. Its totient is φ = 9946171872.

The previous prime is 9960885713. The next prime is 9960885889. The reversal of 9960885821 is 1285880699.

9960885821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1285880699 = 1009 ⋅1274411.

It can be written as a sum of positive squares in 2 ways, for example, as 5444373796 + 4516512025 = 73786^2 + 67205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9960885821 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 (9960885421) 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, 7355960 + ... + 7357313.

It is an arithmetic number, because the mean of its divisors is an integer number (2493899943).

Almost surely, 2^9960885821 is an apocalyptic number.

It is an amenable number.

9960885821 is a deficient number, since it is larger than the sum of its proper divisors (14713951).

9960885821 is a wasteful number, since it uses less digits than its factorization.

9960885821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14713950.

The product of its (nonzero) digits is 2488320, while the sum is 56.

The square root of 9960885821 is about 99804.2374901988. The cubic root of 9960885821 is about 2151.6220549040.

The spelling of 9960885821 in words is "nine billion, nine hundred sixty million, eight hundred eighty-five thousand, eight hundred twenty-one".