1122821 has 4 divisors (see below), whose sum is σ = 1283232. Its totient is φ = 962412.

The previous prime is 1122811. The next prime is 1122841. The reversal of 1122821 is 1282211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1122821 - 2⁶ = 1122757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1122821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80195 + ... + 80208.

It is an arithmetic number, because the mean of its divisors is an integer number (320808).

2^1122821 is an apocalyptic number.

It is an amenable number.

1122821 is a deficient number, since it is larger than the sum of its proper divisors (160411).

1122821 is an equidigital number, since it uses as much as digits as its factorization.

1122821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160410.

The product of its digits is 64, while the sum is 17.

The square root of 1122821 is about 1059.6324834583. The cubic root of 1122821 is about 103.9369995656.

The spelling of 1122821 in words is "one million, one hundred twenty-two thousand, eight hundred twenty-one".