2570221 has 2 divisors, whose sum is σ = 2570222. Its totient is φ = 2570220.

The previous prime is 2570219. The next prime is 2570233. The reversal of 2570221 is 1220752.

It is the 655-th star number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1590121 + 980100 = 1261^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2570221 - 2¹ = 2570219 is a prime.

Together with 2570219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2570201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1285110 + 1285111.

It is an arithmetic number, because the mean of its divisors is an integer number (1285111).

2^2570221 is an apocalyptic number.

It is an amenable number.

2570221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2570221 is an equidigital number, since it uses as much as digits as its factorization.

2570221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 2570221 is about 1603.1908807126. The cubic root of 2570221 is about 136.9798929768.

Adding to 2570221 its reverse (1220752), we get a palindrome (3790973).

The spelling of 2570221 in words is "two million, five hundred seventy thousand, two hundred twenty-one".