1722252321 has 16 divisors (see below), whose sum is σ = 2685774400. Its totient is φ = 1087737984.

The previous prime is 1722252277. The next prime is 1722252361. The reversal of 1722252321 is 1232522271.

It is not a de Polignac number, because 1722252321 - 2⁷ = 1722252193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1722252361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1678096 + ... + 1679121.

It is an arithmetic number, because the mean of its divisors is an integer number (167860900).

Almost surely, 2^1722252321 is an apocalyptic number.

It is an amenable number.

1722252321 is a deficient number, since it is larger than the sum of its proper divisors (963522079).

1722252321 is a wasteful number, since it uses less digits than its factorization.

1722252321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3357245 (or 3357239 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 1722252321 is about 41500.0279638460. The cubic root of 1722252321 is about 1198.6680408677.

Adding to 1722252321 its reverse (1232522271), we get a palindrome (2954774592).

The spelling of 1722252321 in words is "one billion, seven hundred twenty-two million, two hundred fifty-two thousand, three hundred twenty-one".