266821101 has 16 divisors (see below), whose sum is σ = 399369600. Its totient is φ = 176045184.

The previous prime is 266821099. The next prime is 266821109. The reversal of 266821101 is 101128662.

It is not a de Polignac number, because 266821101 - 2¹ = 266821099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266821109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48321 + ... + 53558.

It is an arithmetic number, because the mean of its divisors is an integer number (24960600).

Almost surely, 2^266821101 is an apocalyptic number.

It is an amenable number.

266821101 is a deficient number, since it is larger than the sum of its proper divisors (132548499).

266821101 is a wasteful number, since it uses less digits than its factorization.

266821101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101985 (or 101979 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 266821101 is about 16334.6595005834. The cubic root of 266821101 is about 643.7838196830.

Adding to 266821101 its reverse (101128662), we get a palindrome (367949763).

The spelling of 266821101 in words is "two hundred sixty-six million, eight hundred twenty-one thousand, one hundred one".