829120921 has 4 divisors (see below), whose sum is σ = 829926144. Its totient is φ = 828315700.

The previous prime is 829120891. The next prime is 829120931. The reversal of 829120921 is 129021928.

829120921 is digitally balanced in base 2, 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 829120921 - 2⁷ = 829120793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (829120931) 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, 401065 + ... + 403126.

It is an arithmetic number, because the mean of its divisors is an integer number (207481536).

Almost surely, 2^829120921 is an apocalyptic number.

It is an amenable number.

829120921 is a deficient number, since it is larger than the sum of its proper divisors (805223).

829120921 is a wasteful number, since it uses less digits than its factorization.

829120921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805222.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 829120921 is about 28794.4599011685. The cubic root of 829120921 is about 939.4477369413.

The spelling of 829120921 in words is "eight hundred twenty-nine million, one hundred twenty thousand, nine hundred twenty-one".