1025221 has 4 divisors (see below), whose sum is σ = 1079200. Its totient is φ = 971244.

The previous prime is 1025209. The next prime is 1025231. The reversal of 1025221 is 1225201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1225201 = 53 ⋅23117.

It is a cyclic number.

It is not a de Polignac number, because 1025221 - 2⁷ = 1025093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025231) 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 3 ways as a sum of consecutive naturals, for example, 26961 + ... + 26998.

It is an arithmetic number, because the mean of its divisors is an integer number (269800).

2^1025221 is an apocalyptic number.

It is an amenable number.

1025221 is a deficient number, since it is larger than the sum of its proper divisors (53979).

1025221 is an equidigital number, since it uses as much as digits as its factorization.

1025221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53978.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1025221 is about 1012.5319748038. The cubic root of 1025221 is about 100.8337296314.

The spelling of 1025221 in words is "one million, twenty-five thousand, two hundred twenty-one".