821202930 has 48 divisors (see below), whose sum is σ = 2149303104. Its totient is φ = 217533600.

The previous prime is 821202919. The next prime is 821202953. The reversal of 821202930 is 39202128.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 821202894 and 821202903.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 16624 + ... + 43803.

It is an arithmetic number, because the mean of its divisors is an integer number (44777148).

Almost surely, 2^821202930 is an apocalyptic number.

821202930 is an abundant number, since it is smaller than the sum of its proper divisors (1328100174).

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

821202930 is a wasteful number, since it uses less digits than its factorization.

821202930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60591 (or 60588 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 821202930 is about 28656.6384979118. The cubic root of 821202930 is about 936.4476340697.

The spelling of 821202930 in words is "eight hundred twenty-one million, two hundred two thousand, nine hundred thirty".