821139030 has 24 divisors (see below), whose sum is σ = 2134961712. Its totient is φ = 218970384.

The previous prime is 821139019. The next prime is 821139061. The reversal of 821139030 is 30931128.

821139030 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 821138985 and 821139003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4561794 + ... + 4561973.

It is an arithmetic number, because the mean of its divisors is an integer number (88956738).

Almost surely, 2^821139030 is an apocalyptic number.

821139030 is an abundant number, since it is smaller than the sum of its proper divisors (1313822682).

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

821139030 is a wasteful number, since it uses less digits than its factorization.

821139030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9123780 (or 9123777 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 821139030 is about 28655.5235513155. The cubic root of 821139030 is about 936.4233442733.

The spelling of 821139030 in words is "eight hundred twenty-one million, one hundred thirty-nine thousand, thirty".