1022221 has 8 divisors (see below), whose sum is σ = 1071000. Its totient is φ = 974400.

The previous prime is 1022209. The next prime is 1022237. The reversal of 1022221 is 1222201.

1022221 = T₁₅₈ + T₁₅₉ + ... + T₂₁₅.

It can be written as a sum of positive squares in 4 ways, for example, as 546121 + 476100 = 739^2 + 690^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1022221 - 2¹³ = 1014029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1022198 and 1022207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2755 + ... + 3103.

It is an arithmetic number, because the mean of its divisors is an integer number (133875).

2^1022221 is an apocalyptic number.

It is an amenable number.

1022221 is a deficient number, since it is larger than the sum of its proper divisors (48779).

1022221 is a wasteful number, since it uses less digits than its factorization.

1022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479.

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

The square root of 1022221 is about 1011.0494547746. The cubic root of 1022221 is about 100.7352803770.

Adding to 1022221 its reverse (1222201), we get a palindrome (2244422).

The spelling of 1022221 in words is "one million, twenty-two thousand, two hundred twenty-one".