1222021 has 4 divisors (see below), whose sum is σ = 1245132. Its totient is φ = 1198912.

The previous prime is 1222019. The next prime is 1222027. The reversal of 1222021 is 1202221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1050625 + 171396 = 1025^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222021 - 2¹ = 1222019 is a prime.

It is an Ulam number.

It is a Duffinian number.

1222021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1221989 and 1222007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222027) 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, 11476 + ... + 11581.

It is an arithmetic number, because the mean of its divisors is an integer number (311283).

2^1222021 is an apocalyptic number.

It is an amenable number.

1222021 is a deficient number, since it is larger than the sum of its proper divisors (23111).

1222021 is an equidigital number, since it uses as much as digits as its factorization.

1222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23110.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1222021 is about 1105.4505868649. The cubic root of 1222021 is about 106.9119431580.

Adding to 1222021 its reverse (1202221), we get a palindrome (2424242).

The spelling of 1222021 in words is "one million, two hundred twenty-two thousand, twenty-one".