821430536 has 8 divisors (see below), whose sum is σ = 1540182270. Its totient is φ = 410715264.

The previous prime is 821430523. The next prime is 821430551. The reversal of 821430536 is 635034128.

It can be written as a sum of positive squares in only one way, i.e., 555544900 + 265885636 = 23570^2 + 16306^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51339401 + ... + 51339416.

Almost surely, 2^821430536 is an apocalyptic number.

It is an amenable number.

821430536 is a deficient number, since it is larger than the sum of its proper divisors (718751734).

821430536 is a wasteful number, since it uses less digits than its factorization.

821430536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102678823 (or 102678819 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 821430536 is about 28660.6094840986. The cubic root of 821430536 is about 936.5341418840.

The spelling of 821430536 in words is "eight hundred twenty-one million, four hundred thirty thousand, five hundred thirty-six".