821430330 has 32 divisors (see below), whose sum is σ = 2253066624. Its totient is φ = 187755456.

The previous prime is 821430329. The next prime is 821430373. The reversal of 821430330 is 33034128.

It is a self number, because there is not a number n which added to its sum of digits gives 821430330.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1955577 + ... + 1955996.

It is an arithmetic number, because the mean of its divisors is an integer number (70408332).

Almost surely, 2^821430330 is an apocalyptic number.

821430330 is an abundant number, since it is smaller than the sum of its proper divisors (1431636294).

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

821430330 is a wasteful number, since it uses less digits than its factorization.

821430330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911590.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 821430330 is about 28660.6058903157. The cubic root of 821430330 is about 936.5340635953.

Adding to 821430330 its reverse (33034128), we get a palindrome (854464458).

The spelling of 821430330 in words is "eight hundred twenty-one million, four hundred thirty thousand, three hundred thirty".