1722216164321 has 4 divisors (see below), whose sum is σ = 1724853555732. Its totient is φ = 1719578772912.

The previous prime is 1722216164299. The next prime is 1722216164327. The reversal of 1722216164321 is 1234616122271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143898835600 + 1578317328721 = 379340^2 + 1256311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722216164321 - 2¹⁸ = 1722215902177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1722216164327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1318694726 + ... + 1318696031.

It is an arithmetic number, because the mean of its divisors is an integer number (431213388933).

Almost surely, 2^{1722216164321} is an apocalyptic number.

It is an amenable number.

1722216164321 is a deficient number, since it is larger than the sum of its proper divisors (2637391411).

1722216164321 is an equidigital number, since it uses as much as digits as its factorization.

1722216164321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637391410.

The product of its digits is 48384, while the sum is 38.

The spelling of 1722216164321 in words is "one trillion, seven hundred twenty-two billion, two hundred sixteen million, one hundred sixty-four thousand, three hundred twenty-one".