1745210221 has 2 divisors, whose sum is σ = 1745210222. Its totient is φ = 1745210220.

The previous prime is 1745210213. The next prime is 1745210237. The reversal of 1745210221 is 1220125471.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 944886121 + 800324100 = 30739^2 + 28290^2 .

It is an emirp because it is prime and its reverse (1220125471) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1745210221 - 2³ = 1745210213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1745214221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 872605110 + 872605111.

It is an arithmetic number, because the mean of its divisors is an integer number (872605111).

Almost surely, 2^1745210221 is an apocalyptic number.

It is an amenable number.

1745210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1745210221 is an equidigital number, since it uses as much as digits as its factorization.

1745210221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1745210221 is about 41775.7132913371. The cubic root of 1745210221 is about 1203.9706942845.

Adding to 1745210221 its reverse (1220125471), we get a palindrome (2965335692).

The spelling of 1745210221 in words is "one billion, seven hundred forty-five million, two hundred ten thousand, two hundred twenty-one".