221706314449 has 9 divisors (see below), whose sum is σ = 222396375433. Its totient is φ = 221018392372.

The previous prime is 221706314441. The next prime is 221706314503. The reversal of 221706314449 is 944413607122.

The square root of 221706314449 is 470857.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 221706314449 - 2³ = 221706314441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221706314441) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 225540012 + ... + 225540994.

Almost surely, 2^221706314449 is an apocalyptic number.

221706314449 is the 470857-th square number.

221706314449 is the 235429-th centered octagonal number.

It is an amenable number.

221706314449 is a deficient number, since it is larger than the sum of its proper divisors (690060984).

221706314449 is an frugal number, since it uses more digits than its factorization.

221706314449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2924 (or 1462 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 221706314449 in words is "two hundred twenty-one billion, seven hundred six million, three hundred fourteen thousand, four hundred forty-nine".