820213222 has 4 divisors (see below), whose sum is σ = 1230319836. Its totient is φ = 410106610.

The previous prime is 820213211. The next prime is 820213253. The reversal of 820213222 is 222312028.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 820213193 and 820213202.

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 as a sum of consecutive naturals, namely, 205053304 + ... + 205053307.

It is an arithmetic number, because the mean of its divisors is an integer number (307579959).

Almost surely, 2^820213222 is an apocalyptic number.

820213222 is a deficient number, since it is larger than the sum of its proper divisors (410106614).

820213222 is a wasteful number, since it uses less digits than its factorization.

820213222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410106613.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 820213222 is about 28639.3649021762. The cubic root of 820213222 is about 936.0712828014.

The spelling of 820213222 in words is "eight hundred twenty million, two hundred thirteen thousand, two hundred twenty-two".