821670426 has 32 divisors (see below), whose sum is σ = 1838044800. Its totient is φ = 272073600.

The previous prime is 821670419. The next prime is 821670467. The reversal of 821670426 is 624076128.

821670426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×821670426³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42231 + ... + 58538.

It is an arithmetic number, because the mean of its divisors is an integer number (57438900).

Almost surely, 2^821670426 is an apocalyptic number.

821670426 is an abundant number, since it is smaller than the sum of its proper divisors (1016374374).

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

821670426 is a wasteful number, since it uses less digits than its factorization.

821670426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100931 (or 100925 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 821670426 is about 28664.7941907839. The cubic root of 821670426 is about 936.6253012694.

The spelling of 821670426 in words is "eight hundred twenty-one million, six hundred seventy thousand, four hundred twenty-six".