9211821696 has 384 divisors, whose sum is σ = 34198070400. Its totient is φ = 2309529600.

The previous prime is 9211821677. The next prime is 9211821727. The reversal of 9211821696 is 6961281129.

It is a tau number, because it is divible by the number of its divisors (384).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2570626 + ... + 2574206.

It is an arithmetic number, because the mean of its divisors is an integer number (89057475).

Almost surely, 2^9211821696 is an apocalyptic number.

9211821696 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9211821696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17099035200).

9211821696 is an abundant number, since it is smaller than the sum of its proper divisors (24986248704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9211821696 is a wasteful number, since it uses less digits than its factorization.

9211821696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648 (or 3633 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 9211821696 is about 95978.2355328540. The cubic root of 9211821696 is about 2096.2762198369.

The spelling of 9211821696 in words is "nine billion, two hundred eleven million, eight hundred twenty-one thousand, six hundred ninety-six".