1745022221 has 2 divisors, whose sum is σ = 1745022222. Its totient is φ = 1745022220.

The previous prime is 1745022217. The next prime is 1745022241. The reversal of 1745022221 is 1222205471.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1663824100 + 81198121 = 40790^2 + 9011^2 .

It is a cyclic number.

It is not a de Polignac number, because 1745022221 - 2² = 1745022217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1745022211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 872511110 + 872511111.

It is an arithmetic number, because the mean of its divisors is an integer number (872511111).

Almost surely, 2^1745022221 is an apocalyptic number.

It is an amenable number.

1745022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1745022221 is an equidigital number, since it uses as much as digits as its factorization.

1745022221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 1745022221 is about 41773.4631195452. The cubic root of 1745022221 is about 1203.9274607883.

Adding to 1745022221 its reverse (1222205471), we get a palindrome (2967227692).

The spelling of 1745022221 in words is "one billion, seven hundred forty-five million, twenty-two thousand, two hundred twenty-one".