821603012 has 12 divisors (see below), whose sum is σ = 1439725056. Its totient is φ = 410253000.

The previous prime is 821603011. The next prime is 821603039. The reversal of 821603012 is 210306128.

It is not an unprimeable number, because it can be changed into a prime (821603011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133748 + ... + 139755.

It is an arithmetic number, because the mean of its divisors is an integer number (119977088).

Almost surely, 2^821603012 is an apocalyptic number.

It is an amenable number.

821603012 is a deficient number, since it is larger than the sum of its proper divisors (618122044).

821603012 is a wasteful number, since it uses less digits than its factorization.

821603012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274258 (or 274256 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 821603012 is about 28663.6182642736. The cubic root of 821603012 is about 936.5996854089.

The spelling of 821603012 in words is "eight hundred twenty-one million, six hundred three thousand, twelve".