1010221 has 4 divisors (see below), whose sum is σ = 1026844. Its totient is φ = 993600.

The previous prime is 1010203. The next prime is 1010237. The reversal of 1010221 is 1220101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1220101 = 89 ⋅13709.

It can be written as a sum of positive squares in 2 ways, for example, as 38025 + 972196 = 195^2 + 986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1010221 is a prime.

It is an Ulam number.

It is a Duffinian number.

1010221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010201) 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, 8220 + ... + 8341.

It is an arithmetic number, because the mean of its divisors is an integer number (256711).

2^1010221 is an apocalyptic number.

It is an amenable number.

1010221 is a deficient number, since it is larger than the sum of its proper divisors (16623).

1010221 is an equidigital number, since it uses as much as digits as its factorization.

1010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16622.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1010221 is about 1005.0975077076. The cubic root of 1010221 is about 100.3395457817.

Adding to 1010221 its reverse (1220101), we get a palindrome (2230322).

The spelling of 1010221 in words is "one million, ten thousand, two hundred twenty-one".