1020221 has 4 divisors (see below), whose sum is σ = 1080252. Its totient is φ = 960192.

The previous prime is 1020163. The next prime is 1020223. The reversal of 1020221 is 1220201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1220201 = 41 ⋅29761.

It can be written as a sum of positive squares in 2 ways, for example, as 784996 + 235225 = 886^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020221 - 2⁶ = 1020157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1020199 and 1020208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020223) 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, 29990 + ... + 30023.

It is an arithmetic number, because the mean of its divisors is an integer number (270063).

2^1020221 is an apocalyptic number.

It is an amenable number.

1020221 is a deficient number, since it is larger than the sum of its proper divisors (60031).

1020221 is an equidigital number, since it uses as much as digits as its factorization.

1020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60030.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1020221 is about 1010.0598992139. The cubic root of 1020221 is about 100.6695404839.

Adding to 1020221 its reverse (1220201), we get a palindrome (2240422).

The spelling of 1020221 in words is "one million, twenty thousand, two hundred twenty-one".