821281420 has 12 divisors (see below), whose sum is σ = 1724691024. Its totient is φ = 328512560.

The previous prime is 821281411. The next prime is 821281423. The reversal of 821281420 is 24182128.

It is not an unprimeable number, because it can be changed into a prime (821281423) 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, 20532016 + ... + 20532055.

It is an arithmetic number, because the mean of its divisors is an integer number (143724252).

Almost surely, 2^821281420 is an apocalyptic number.

It is an amenable number.

821281420 is an abundant number, since it is smaller than the sum of its proper divisors (903409604).

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

821281420 is a wasteful number, since it uses less digits than its factorization.

821281420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41064080 (or 41064078 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 821281420 is about 28658.0079558925. The cubic root of 821281420 is about 936.4774681219.

The spelling of 821281420 in words is "eight hundred twenty-one million, two hundred eighty-one thousand, four hundred twenty".