820521022 has 16 divisors (see below), whose sum is σ = 1248771312. Its totient is φ = 404274240.

The previous prime is 820521019. The next prime is 820521029. The reversal of 820521022 is 220125028.

It is a junction number, because it is equal to n+sod(n) for n = 820520984 and 820521002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820521029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234933 + ... + 238399.

It is an arithmetic number, because the mean of its divisors is an integer number (78048207).

Almost surely, 2^820521022 is an apocalyptic number.

820521022 is a deficient number, since it is larger than the sum of its proper divisors (428250290).

820521022 is a wasteful number, since it uses less digits than its factorization.

820521022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5163.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 820521022 is about 28644.7381206392. The cubic root of 820521022 is about 936.1883607756.

The spelling of 820521022 in words is "eight hundred twenty million, five hundred twenty-one thousand, twenty-two".