266770021 has 4 divisors (see below), whose sum is σ = 304880032. Its totient is φ = 228660012.

The previous prime is 266770003. The next prime is 266770033. The reversal of 266770021 is 120077662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-266770021 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 (266770121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19054995 + ... + 19055008.

It is an arithmetic number, because the mean of its divisors is an integer number (76220008).

Almost surely, 2^266770021 is an apocalyptic number.

It is an amenable number.

266770021 is a deficient number, since it is larger than the sum of its proper divisors (38110011).

266770021 is an equidigital number, since it uses as much as digits as its factorization.

266770021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38110010.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 266770021 is about 16333.0958792263. The cubic root of 266770021 is about 643.7427352559.

The spelling of 266770021 in words is "two hundred sixty-six million, seven hundred seventy thousand, twenty-one".