221169862369 has 9 divisors (see below), whose sum is σ = 224042554323. Its totient is φ = 218333561472.

The previous prime is 221169862301. The next prime is 221169862373. The reversal of 221169862369 is 963268961122.

The square root of 221169862369 is 470287.

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

221169862369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1853733025 + 219316129344 = 43055^2 + 468312^2 .

It is not a de Polignac number, because 221169862369 - 2¹³ = 221169854177 is a prime.

It is a super-2 number, since 2×221169862369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221169862169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 37149697 + ... + 37155649.

It is an arithmetic number, because the mean of its divisors is an integer number (24893617147).

Almost surely, 2^221169862369 is an apocalyptic number.

221169862369 is the 470287-th square number.

221169862369 is the 235144-th centered octagonal number.

It is an amenable number.

221169862369 is a deficient number, since it is larger than the sum of its proper divisors (2872691954).

221169862369 is an frugal number, since it uses more digits than its factorization.

221169862369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12064 (or 6032 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 55.

The spelling of 221169862369 in words is "two hundred twenty-one billion, one hundred sixty-nine million, eight hundred sixty-two thousand, three hundred sixty-nine".