266836421 has 2 divisors, whose sum is σ = 266836422. Its totient is φ = 266836420.

The previous prime is 266836393. The next prime is 266836429. The reversal of 266836421 is 124638662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134908225 + 131928196 = 11615^2 + 11486^2 .

It is a cyclic number.

It is not a de Polignac number, because 266836421 - 2²⁶ = 199727557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266836429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133418210 + 133418211.

It is an arithmetic number, because the mean of its divisors is an integer number (133418211).

Almost surely, 2^266836421 is an apocalyptic number.

It is an amenable number.

266836421 is a deficient number, since it is larger than the sum of its proper divisors (1).

266836421 is an equidigital number, since it uses as much as digits as its factorization.

266836421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 38.

The square root of 266836421 is about 16335.1284353690. The cubic root of 266836421 is about 643.7961407717.

The spelling of 266836421 in words is "two hundred sixty-six million, eight hundred thirty-six thousand, four hundred twenty-one".