266132221 has 4 divisors (see below), whose sum is σ = 280139200. Its totient is φ = 252125244.

The previous prime is 266132197. The next prime is 266132233. The reversal of 266132221 is 122231662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 266132221 - 2²⁷ = 131914493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266132261) 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, 7003461 + ... + 7003498.

It is an arithmetic number, because the mean of its divisors is an integer number (70034800).

Almost surely, 2^266132221 is an apocalyptic number.

It is an amenable number.

266132221 is a deficient number, since it is larger than the sum of its proper divisors (14006979).

266132221 is a wasteful number, since it uses less digits than its factorization.

266132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14006978.

The product of its digits is 1728, while the sum is 25.

The square root of 266132221 is about 16313.5594215364. The cubic root of 266132221 is about 643.2293008032.

Adding to 266132221 its reverse (122231662), we get a palindrome (388363883).

The spelling of 266132221 in words is "two hundred sixty-six million, one hundred thirty-two thousand, two hundred twenty-one".