266411021 has 2 divisors, whose sum is σ = 266411022. Its totient is φ = 266411020.

The previous prime is 266411011. The next prime is 266411069. The reversal of 266411021 is 120114662.

266411021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 265233796 + 1177225 = 16286^2 + 1085^2 .

It is a cyclic number.

It is not a de Polignac number, because 266411021 - 2¹⁸ = 266148877 is a prime.

It is a super-2 number, since 2×266411021² = 141949664220524882, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266411011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133205510 + 133205511.

It is an arithmetic number, because the mean of its divisors is an integer number (133205511).

Almost surely, 2^266411021 is an apocalyptic number.

It is an amenable number.

266411021 is a deficient number, since it is larger than the sum of its proper divisors (1).

266411021 is an equidigital number, since it uses as much as digits as its factorization.

266411021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 266411021 is about 16322.1022236720. The cubic root of 266411021 is about 643.4538379925.

Adding to 266411021 its reverse (120114662), we get a palindrome (386525683).

The spelling of 266411021 in words is "two hundred sixty-six million, four hundred eleven thousand, twenty-one".