821122 has 4 divisors (see below), whose sum is σ = 1231686. Its totient is φ = 410560.

The previous prime is 821113. The next prime is 821131. The reversal of 821122 is 221128.

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

It is an interprime number because it is at equal distance from previous prime (821113) and next prime (821131).

It can be written as a sum of positive squares in only one way, i.e., 450241 + 370881 = 671^2 + 609^2 .

It is a pancake number, because a pancake can be divided into 821122 parts by 1281 straight cuts.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 821096 and 821105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205279 + ... + 205282.

2⁸²¹¹²² is an apocalyptic number.

821122 is a deficient number, since it is larger than the sum of its proper divisors (410564).

821122 is a wasteful number, since it uses less digits than its factorization.

821122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410563.

The product of its digits is 64, while the sum is 16.

The square root of 821122 is about 906.1578228984. The cubic root of 821122 is about 93.6416870583.

The spelling of 821122 in words is "eight hundred twenty-one thousand, one hundred twenty-two".