1266004221 has 8 divisors (see below), whose sum is σ = 1691363520. Its totient is φ = 842323872.

The previous prime is 1266004213. The next prime is 1266004231. The reversal of 1266004221 is 1224006621.

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

It is not a de Polignac number, because 1266004221 - 2³ = 1266004213 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1266004191 and 1266004200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266004231) 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, 417976 + ... + 420993.

It is an arithmetic number, because the mean of its divisors is an integer number (211420440).

Almost surely, 2^1266004221 is an apocalyptic number.

It is an amenable number.

1266004221 is a deficient number, since it is larger than the sum of its proper divisors (425359299).

1266004221 is an equidigital number, since it uses as much as digits as its factorization.

1266004221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839475.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1266004221 is about 35580.9530648070. The cubic root of 1266004221 is about 1081.7952027592.

The spelling of 1266004221 in words is "one billion, two hundred sixty-six million, four thousand, two hundred twenty-one".