821420412 has 24 divisors (see below), whose sum is σ = 1917154512. Its totient is φ = 273734400.

The previous prime is 821420401. The next prime is 821420437. The reversal of 821420412 is 214024128.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 58212 + ... + 70932.

It is an arithmetic number, because the mean of its divisors is an integer number (79881438).

Almost surely, 2^821420412 is an apocalyptic number.

It is an amenable number.

821420412 is an abundant number, since it is smaller than the sum of its proper divisors (1095734100).

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

821420412 is a wasteful number, since it uses less digits than its factorization.

821420412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18109 (or 18107 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 821420412 is about 28660.4328648400. The cubic root of 821420412 is about 936.5302943237.

The spelling of 821420412 in words is "eight hundred twenty-one million, four hundred twenty thousand, four hundred twelve".