266266021 has 8 divisors (see below), whose sum is σ = 307259264. Its totient is φ = 226011600.

The previous prime is 266265983. The next prime is 266266027. The reversal of 266266021 is 120662662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 266266021 - 2¹¹ = 266263973 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 (266266027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183930 + ... + 185371.

It is an arithmetic number, because the mean of its divisors is an integer number (38407408).

Almost surely, 2^266266021 is an apocalyptic number.

It is an amenable number.

266266021 is a deficient number, since it is larger than the sum of its proper divisors (40993243).

266266021 is a wasteful number, since it uses less digits than its factorization.

266266021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369411.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 266266021 is about 16317.6597893203. The cubic root of 266266021 is about 643.3370788856.

The spelling of 266266021 in words is "two hundred sixty-six million, two hundred sixty-six thousand, twenty-one".