266121 has 6 divisors (see below), whose sum is σ = 384410. Its totient is φ = 177408.

The previous prime is 266117. The next prime is 266129. The reversal of 266121 is 121662.

It is a happy number.

266121 is a `hidden beast` number, since 2 + 661 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 230400 + 35721 = 480^2 + 189^2 .

It is not a de Polignac number, because 266121 - 2² = 266117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 266094 and 266103.

It is not an unprimeable number, because it can be changed into a prime (266129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14776 + ... + 14793.

2²⁶⁶¹²¹ is an apocalyptic number.

It is an amenable number.

266121 is a deficient number, since it is larger than the sum of its proper divisors (118289).

266121 is a wasteful number, since it uses less digits than its factorization.

266121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29575 (or 29572 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 266121 is about 515.8691694606. The cubic root of 266121 is about 64.3220260463.

Adding to 266121 its reverse (121662), we get a palindrome (387783).

The spelling of 266121 in words is "two hundred sixty-six thousand, one hundred twenty-one".