821582012 has 6 divisors (see below), whose sum is σ = 1437768528. Its totient is φ = 410791004.

The previous prime is 821582009. The next prime is 821582023. The reversal of 821582012 is 210285128.

It is a happy number.

821582012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102697748 + ... + 102697755.

It is an arithmetic number, because the mean of its divisors is an integer number (239628088).

Almost surely, 2^821582012 is an apocalyptic number.

It is an amenable number.

821582012 is a deficient number, since it is larger than the sum of its proper divisors (616186516).

821582012 is a wasteful number, since it uses less digits than its factorization.

821582012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205395507 (or 205395505 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 821582012 is about 28663.2519439089. The cubic root of 821582012 is about 936.5917055774.

The spelling of 821582012 in words is "eight hundred twenty-one million, five hundred eighty-two thousand, twelve".