821490012 has 120 divisors (see below), whose sum is σ = 2464973280. Its totient is φ = 233694720.

The previous prime is 821489971. The next prime is 821490013. The reversal of 821490012 is 210094128.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821490013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 636664 + ... + 637952.

It is an arithmetic number, because the mean of its divisors is an integer number (20541444).

Almost surely, 2^821490012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 821490012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1232486640).

821490012 is an abundant number, since it is smaller than the sum of its proper divisors (1643483268).

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

821490012 is a wasteful number, since it uses less digits than its factorization.

821490012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 821490012 is about 28661.6470566505. The cubic root of 821490012 is about 936.5567447124.

The spelling of 821490012 in words is "eight hundred twenty-one million, four hundred ninety thousand, twelve".