266143421 has 2 divisors, whose sum is σ = 266143422. Its totient is φ = 266143420.

The previous prime is 266143379. The next prime is 266143433. The reversal of 266143421 is 124341662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246019225 + 20124196 = 15685^2 + 4486^2 .

It is a cyclic number.

It is not a de Polignac number, because 266143421 - 2¹⁰ = 266142397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266143441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133071710 + 133071711.

It is an arithmetic number, because the mean of its divisors is an integer number (133071711).

Almost surely, 2^266143421 is an apocalyptic number.

It is an amenable number.

266143421 is a deficient number, since it is larger than the sum of its proper divisors (1).

266143421 is an equidigital number, since it uses as much as digits as its factorization.

266143421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 266143421 is about 16313.9026906501. The cubic root of 266143421 is about 643.2383239710.

The spelling of 266143421 in words is "two hundred sixty-six million, one hundred forty-three thousand, four hundred twenty-one".