266101321 has 4 divisors (see below), whose sum is σ = 266234500. Its totient is φ = 265968144.

The previous prime is 266101301. The next prime is 266101331. The reversal of 266101321 is 123101662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123101662 = 2 ⋅61550831.

It can be written as a sum of positive squares in 2 ways, for example, as 242238096 + 23863225 = 15564^2 + 4885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266101321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 266101292 and 266101301.

It is not an unprimeable number, because it can be changed into a prime (266101301) 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, 63546 + ... + 67603.

It is an arithmetic number, because the mean of its divisors is an integer number (66558625).

Almost surely, 2^266101321 is an apocalyptic number.

It is an amenable number.

266101321 is a deficient number, since it is larger than the sum of its proper divisors (133179).

266101321 is a wasteful number, since it uses less digits than its factorization.

266101321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133178.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 266101321 is about 16312.6123291152. The cubic root of 266101321 is about 643.2044052148.

Adding to 266101321 its reverse (123101662), we get a palindrome (389202983).

The spelling of 266101321 in words is "two hundred sixty-six million, one hundred one thousand, three hundred twenty-one".