821422 has 16 divisors (see below), whose sum is σ = 1469952. Its totient is φ = 336600.

The previous prime is 821411. The next prime is 821441. The reversal of 821422 is 224128.

It is a self number, because there is not a number n which added to its sum of digits gives 821422.

It is a congruent number.

It is an unprimeable number.

821422 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954 + ... + 1597.

It is an arithmetic number, because the mean of its divisors is an integer number (91872).

2⁸²¹⁴²² is an apocalyptic number.

821422 is a deficient number, since it is larger than the sum of its proper divisors (648530).

821422 is a wasteful number, since it uses less digits than its factorization.

821422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583.

The product of its digits is 256, while the sum is 19.

The square root of 821422 is about 906.3233418598. The cubic root of 821422 is about 93.6530897835.

The spelling of 821422 in words is "eight hundred twenty-one thousand, four hundred twenty-two".