821068420 has 24 divisors (see below), whose sum is σ = 1733004504. Its totient is φ = 326758656.

The previous prime is 821068411. The next prime is 821068429. The reversal of 821068420 is 24860128.

It is an interprime number because it is at equal distance from previous prime (821068411) and next prime (821068429).

It can be written as a sum of positive squares in 4 ways, for example, as 375351876 + 445716544 = 19374^2 + 21112^2 .

It is not an unprimeable number, because it can be changed into a prime (821068429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100257 + ... + 108136.

It is an arithmetic number, because the mean of its divisors is an integer number (72208521).

Almost surely, 2^821068420 is an apocalyptic number.

It is an amenable number.

821068420 is an abundant number, since it is smaller than the sum of its proper divisors (911936084).

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

821068420 is a wasteful number, since it uses less digits than its factorization.

821068420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208599 (or 208597 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 821068420 is about 28654.2914761472. The cubic root of 821068420 is about 936.3965023926.

The spelling of 821068420 in words is "eight hundred twenty-one million, sixty-eight thousand, four hundred twenty".