1725213170221 has 2 divisors, whose sum is σ = 1725213170222. Its totient is φ = 1725213170220.

The previous prime is 1725213170207. The next prime is 1725213170321. The reversal of 1725213170221 is 1220713125271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279136118121 + 446077052100 = 1130989^2 + 667890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1725213170221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1725213170321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 862606585110 + 862606585111.

It is an arithmetic number, because the mean of its divisors is an integer number (862606585111).

Almost surely, 2^{1725213170221} is an apocalyptic number.

It is an amenable number.

1725213170221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1725213170221 is an equidigital number, since it uses as much as digits as its factorization.

1725213170221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11760, while the sum is 34.

Adding to 1725213170221 its reverse (1220713125271), we get a palindrome (2945926295492).

The spelling of 1725213170221 in words is "one trillion, seven hundred twenty-five billion, two hundred thirteen million, one hundred seventy thousand, two hundred twenty-one".